Slow Computer and High CPU Usage

I have a rather aged Medion Computer with a Pentium 4 2Ghz motherboard and 512 mg of memory. About a year ago, I removed about 600 problems using spybot. Strangely enough, the computer ran well before and after the deletions. The problem was when trying to connect to the internet. Recently, however, the computer freezes momentarily when running itunes or three programs at a time. I remember being able to run photoshop well while on the web and downloading video from my camera. I do not know if this is a problem of age or with spyware. CPU usage is usually high. Here is the log after running hijackthis.

Thanks for your help.

Logfile of HijackThis v1.99.1
Scan saved at 7:09:52 PM, on 11/26/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\WINDOWS\system32\CTsvcCDA.EXE
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Norton AntiVirus\navapsvc.exe
C:\Program Files\Norton AntiVirus\AdvTools\NPROTECT.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Norton AntiVirus\SAVScan.exe
C:\Program Files\Photodex\ProShowGold\ScsiAccess.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\WINDOWS\System32\MsPMSPSv.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\Logitech\MOUSEW~1\SYSTEM\EM_EXEC.EXE
C:\WINDOWS\TPPALDR.EXE
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files\Handspring\HotSync.exe
C:\Program Files\Yahoo!\Messenger\ymsgr_tray.exe
C:\WINDOWS\system32\taskmgr.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\XoftSpy\XoftSpy.exe
C:\Program Files\Messenger\msmsgs.exe
C:\unzipped\hijackthis\HijackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.aldi-stores.co.uk/
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/customize/…//www.yahoo.com
N3 - Netscape 7: user_pref("browser.startup.homepage", "http://google.com"); (C:\Documents and Settings\CARLOS LEMUS\Application Data\Mozilla\Profiles\default\vd7tex8s.slt\prefs.js)
N3 - Netscape 7: user_pref("browser.search.defaultengine", "engine://C%3A%5CProgram%20Files%5CNetscape%5CNetscape%5Csearchplugins%5CSBWeb_01.src"); (C:\Documents and Settings\CARLOS LEMUS\Application Data\Mozilla\Profiles\default\vd7tex8s.slt\prefs.js)
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - (no file)
O2 - BHO: (no name) - {27557cf1-a237-496d-8c8f-08f3844c6a8b} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: CNavExtBho Class - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE NvQTwk,NvCplDaemon initialize
O4 - HKLM\..\Run: [EM_EXEC] C:\PROGRA~1\Logitech\MOUSEW~1\SYSTEM\EM_EXEC.EXE
O4 - HKLM\..\Run: [TPP Auto Loader] C:\WINDOWS\TPPALDR.EXE
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [Advanced Tools Check] C:\PROGRA~1\NORTON~1\AdvTools\ADVCHK.EXE
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [MSConfig] C:\WINDOWS\PCHealth\HelpCtr\Binaries\MSConfig.exe /auto
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE"
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - Startup: HotSync Manager.lnk = C:\Program Files\Handspring2\HOTSYNC.EXE
O4 - Startup: PowerReg Scheduler.exe
O4 - Global Startup: HotSync Manager.lnk = C:\Program Files\Handspring\HotSync.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~4\Office10\EXCEL.EXE/3000
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra 'Tools' menuitem: Create Mobile Favorite… - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: Share in Hello - {B13B4423-2647-4cfc-A4B3-C7D56CB83487} - C:\Program Files\Hello\PicasaCapture.dll
O9 - Extra 'Tools' menuitem: Share in H&ello - {B13B4423-2647-4cfc-A4B3-C7D56CB83487} - C:\Program Files\Hello\PicasaCapture.dll
O9 - Extra button: (no name) - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - (no file)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra button: Medion-UK - {7AF6CC0F-E0BF-4ED2-BF73-10C2B79BFB8B} - http://www.medion.co.uk (file missing) (HKCU)
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O15 - Trusted Zone: http://*.windowsupdate.com
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O23 - Service: Adobe LM Service - Unknown owner - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Norton AntiVirus Auto Protect Service (navapsvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton Unerase Protection (NProtectService) - Symantec Corporation - C:\Program Files\Norton AntiVirus\AdvTools\NPROTECT.EXE
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: SAVScan - Symantec Corporation - C:\Program Files\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\COMMON~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: ScsiAccess - Unknown owner - C:\Program Files\Photodex\ProShowGold\ScsiAccess.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec Core LC - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
O23 - Service: TuneUp WinStyler Theme Service (TUWinStylerThemeSvc) - TuneUp Software GmbH - C:\Program Files\TuneUp Utilities 2006\WinStylerThemeSvc.exe

Thanks for your reply, pskelley.

I believe I have followed your instructions as fully as possible. Here are the two lists you requested. I have monitored the programs causing the cpu spike: they are basically any at any different time. For example, I am currently running firefox and every two or three seconds it runs as high as 90%. Then, I recently was unable to use Photoshop because of an error saying that I did not have sufficient memory. I restarted and the problem remained. Thanks for you assistance.

Logfile of HijackThis v1.99.1
Scan saved at 8:28:28 PM, on 12/3/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\CTsvcCDA.EXE
H:\Program Files\security suite\ewidoctrl.exe
H:\Program Files\security suite\ewidoguard.exe
C:\PROGRA~1\Logitech\MOUSEW~1\SYSTEM\EM_EXEC.EXE
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Norton AntiVirus\navapsvc.exe
C:\Program Files\Norton AntiVirus\AdvTools\NPROTECT.EXE
C:\WINDOWS\System32\nvsvc32.exe
C:\Program Files\Norton AntiVirus\SAVScan.exe
C:\WINDOWS\TPPALDR.EXE
C:\Program Files\Photodex\ProShowGold\ScsiAccess.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\Program Files\Common Files\Symantec Shared\ccApp.exe
C:\WINDOWS\System32\MsPMSPSv.exe
C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\system32\fxssvc.exe
C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE
C:\Program Files\Handspring\HotSync.exe
C:\Program Files\Yahoo!\Messenger\ymsgr_tray.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe
C:\Program Files\CCleaner\ccleaner.exe
C:\Program Files\Messenger\msmsgs.exe
C:\unzipped\hijackthis\HijackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.aldi-stores.co.uk/
N3 - Netscape 7: user_pref("browser.startup.homepage", "http://google.com"); (C:\Documents and Settings\CARLOS LEMUS\Application Data\Mozilla\Profiles\default\vd7tex8s.slt\prefs.js)
N3 - Netscape 7: user_pref("browser.search.defaultengine", "engine://C%3A%5CProgram%20Files%5CNetscape%5CNetscape%5Csearchplugins%5CSBWeb_01.src"); (C:\Documents and Settings\CARLOS LEMUS\Application Data\Mozilla\Profiles\default\vd7tex8s.slt\prefs.js)
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - (no file)
O2 - BHO: CNavExtBho Class - {BDF3E430-B101-42AD-A544-FADC6B084872} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O3 - Toolbar: Norton AntiVirus - {42CDD1BF-3FFB-4238-8AD1-7859DF00B1D6} - C:\Program Files\Norton AntiVirus\NavShExt.dll
O4 - HKLM\..\Run: [EM_EXEC] C:\PROGRA~1\Logitech\MOUSEW~1\SYSTEM\EM_EXEC.EXE
O4 - HKLM\..\Run: [TPP Auto Loader] C:\WINDOWS\TPPALDR.EXE
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Common Files\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [Advanced Tools Check] C:\PROGRA~1\NORTON~1\AdvTools\ADVCHK.EXE
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] C:\PROGRA~1\SYMNET~1\SNDMon.exe /Consumer
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [H/PC Connection Agent] "C:\Program Files\Microsoft ActiveSync\WCESCOMM.EXE"
O4 - HKCU\..\Run: [Yahoo! Pager] "C:\Program Files\Yahoo!\Messenger\ypager.exe" -quiet
O4 - Global Startup: HotSync Manager.lnk = C:\Program Files\Handspring\HotSync.exe
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~4\Office10\EXCEL.EXE/3000
O9 - Extra button: Create Mobile Favorite - {2EAF5BB1-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: (no name) - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra 'Tools' menuitem: Create Mobile Favorite… - {2EAF5BB2-070F-11D3-9307-00C04FAE2D4F} - C:\Program Files\Microsoft ActiveSync\inetrepl.dll
O9 - Extra button: Share in Hello - {B13B4423-2647-4cfc-A4B3-C7D56CB83487} - C:\Program Files\Hello\PicasaCapture.dll
O9 - Extra 'Tools' menuitem: Share in H&ello - {B13B4423-2647-4cfc-A4B3-C7D56CB83487} - C:\Program Files\Hello\PicasaCapture.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra button: Medion-UK - {7AF6CC0F-E0BF-4ED2-BF73-10C2B79BFB8B} - http://www.medion.co.uk (file missing) (HKCU)
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O15 - Trusted Zone: http://*.windowsupdate.com
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O23 - Service: Adobe LM Service - Unknown owner - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\system32\CTsvcCDA.EXE
O23 - Service: ewido security suite control - ewido networks - H:\Program Files\security suite\ewidoctrl.exe
O23 - Service: ewido security suite guard - ewido networks - H:\Program Files\security suite\ewidoguard.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Common Files\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: iPodService - Apple Computer, Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Norton AntiVirus Auto Protect Service (navapsvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\navapsvc.exe
O23 - Service: Norton Unerase Protection (NProtectService) - Symantec Corporation - C:\Program Files\Norton AntiVirus\AdvTools\NPROTECT.EXE
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: SAVScan - Symantec Corporation - C:\Program Files\Norton AntiVirus\SAVScan.exe
O23 - Service: ScriptBlocking Service (SBService) - Symantec Corporation - C:\PROGRA~1\COMMON~1\SYMANT~1\SCRIPT~1\SBServ.exe
O23 - Service: ScsiAccess - Unknown owner - C:\Program Files\Photodex\ProShowGold\ScsiAccess.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec Core LC - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - C:\Program Files\Common Files\Symantec Shared\Security Center\SymWSC.exe
O23 - Service: TuneUp WinStyler Theme Service (TUWinStylerThemeSvc) - TuneUp Software GmbH - C:\Program Files\TuneUp Utilities 2006\WinStylerThemeSvc.exe


UNINSTALL LIST

2Wire Wireless Client
Ad-Aware SE Personal
Adobe Acrobat 5.0
Adobe PageMaker 7.0
Ahead ImageDrive
APA-Style Helper 5.1
AudibleManager
Caere Scan Manager 5.1
Canon ScanGear Toolbox CS 2.5
CardNavigator1.0
CC_ccStart
ccCommon
Cool Edit Pro 2.0
Corel Uninstaller
Creative MediaSource
Creative PC-CAM Center
Creative WebCam Monitor
Creative WebCam Pro Driver
Creative WebCam Pro Manual (English)
DivX Player
DivX Pro Codec
Dr. DivX
Dramatica Pro 4.0
DVD X Rescue
DVDXCopy Platinum 3.2.1
DVDXCopy Xpress 3.0.1
eMule
ewido security suite
Final Draft 6
Final Draft v6.0.2.5 Update
Games X Copy
Hello (remove only)
HijackThis 1.99.1
HP Photo and Imaging 2.0 - All-in-One
HP Photo and Imaging 2.0 - All-in-One Drivers
Informations about your PC
Intellisharpen
iTunes
Java 2 Runtime Environment, SE v1.4.0_01
Java Web Start
LexarMedia ImageRescue Software
LiveReg (Symantec Corporation)
LiveUpdate 2.6 (Symantec Corporation)
Logitech Resource Center
Medi@Show
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1 Hotfix (KB886903)
Microsoft ActiveSync 3.7
Microsoft Chat 2.5
Microsoft Encarta Encyclopedia Standard 2002
Microsoft Money 2004
Microsoft Money 2004 System Pack
Microsoft Money for the Pocket PC
Microsoft Picture It! Photo 2002
Microsoft Pocket Streets for Pocket PC
Microsoft Streets and Trips 2002
Microsoft Word 2002
Microsoft XML Parser and SDK
MixMeister Pro 4
Mozilla Firefox (1.0.7)
MSN Messenger 6.2
MSRedist
MultiMediaNavigator2.0
MuVo Driver
Netscape (7.0)
Norton AntiVirus 2004 Professional
Norton AntiVirus 2004 Professional (Symantec Corporation)
Norton AntiVirus Parent MSI
Norton AntiVirus SYMLT MSI
Norton WMI Update
NVIDIA Windows 2000/XP Display Drivers
OmniPage Pro 9.0
Palm Desktop and Synchronization Software
Palmtop Collins E-S (Insert Product CD, Remove Only)
Photodex Presenter
Picasa 2
Power Cinema
PowerDirector Pro
ProShow Gold
QuickTime
Registry Mechanic 5.0
SBC Yahoo! Applications
Security Task Manager 1.6c
Security Update for Step By Step Interactive Training (KB898458)
Security Update for Windows XP (KB883939)
Security Update for Windows XP (KB890046)
Security Update for Windows XP (KB893756)
Security Update for Windows XP (KB896358)
Security Update for Windows XP (KB896422)
Security Update for Windows XP (KB896423)
Security Update for Windows XP (KB896424)
Security Update for Windows XP (KB896428)
Security Update for Windows XP (KB896688)
Security Update for Windows XP (KB899587)
Security Update for Windows XP (KB899588)
Security Update for Windows XP (KB899591)
Security Update for Windows XP (KB900725)
Security Update for Windows XP (KB901017)
Security Update for Windows XP (KB901214)
Security Update for Windows XP (KB902400)
Security Update for Windows XP (KB903235)
Security Update for Windows XP (KB904706)
Security Update for Windows XP (KB905414)
Security Update for Windows XP (KB905749)
Sentinel System Driver
Shockwave
Spybot - Search & Destroy 1.4
SpywareBlaster v3.4
Symantec Script Blocking Installer
SymNet
TomeRaider3
TomeRaider3 v3.1.02
TuneUp Utilities 2006
Ulead DVD MovieFactory
Update for Windows XP (KB894391)
Update for Windows XP (KB896727)
Update for Windows XP (KB898461)
USB Storage Adapter (TPP)
USB Storage Adapter V2 (TPP)
USB Storage Adapter V3 (TPP)
Windows Backup Utility
Windows Installer 3.1 (KB893803)
Windows Installer 3.1 (KB893803)
Windows Media Format Runtime
Windows Media Player 10
Windows XP Hotfix - KB834707
Windows XP Hotfix - KB867282
Windows XP Hotfix - KB873333
Windows XP Hotfix - KB873339
Windows XP Hotfix - KB885250
Windows XP Hotfix - KB885835
Windows XP Hotfix - KB885836
Windows XP Hotfix - KB885884
Windows XP Hotfix - KB886185
Windows XP Hotfix - KB887472
Windows XP Hotfix - KB887742
Windows XP Hotfix - KB888113
Windows XP Hotfix - KB888302
Windows XP Hotfix - KB890047
Windows XP Hotfix - KB890175
Windows XP Hotfix - KB890859
Windows XP Hotfix - KB890923
Windows XP Hotfix - KB891781
Windows XP Hotfix - KB893066
Windows XP Hotfix - KB893086
Windows XP Service Pack 2
WinRAR archiver
Wintuneup Pro
WinZip
Yahoo! Install Manager
Yahoo! Messenger

Before I look at the logs, let me comment on high CPU usage. Many, Many things can cause this, here is the Google on that:
http://www.google.com/search?hl=en&rls=GGL…U+usage&spell=1 While malware can cause it also, I personally find it is usually something else. Anymore most malware writers are concerned with $$$ in their pockets and placing popups for legitimate businesses in front of you rather you want them or not, this is how they get that $$$. I will suggest a diagnostic free here: http://www.pcpitstop.com/ and they will help understand the results here: http://pcpitstop.invisionzone.com/index.php?showforum=6

I have monitored the programs causing the cpu spike: they are basically any at any different time.

Do a little troubleshooting, find the program causing the spike and use MSConfig to turn it off, run for a while to see what happens. It may be a bad driver related to the program causing the issues. http://kadaitcha.cx/high_cpu.html

Then, I recently was unable to use Photoshop because of an error saying that I did not have sufficient memory

Keep in mind that with the resource heavy programs available now, 512 megs of RAM is sure not a lot. I would put as much RAM in your computer as you can afford. This is the cheapest way to upgrade.

I'll look at the unistall program list first, keep in mind I am looking for problems. You should use the list to see what is there you so longer use or do not know, this is a great chance to clean up old programs.
Adobe Acrobat 5.0: If you use Adobe, 7.0 has been out for a while.
ewido security suite: If you own it fine, if not turn it totally off even in services. You can update and scan manually for as long as you wish.
Java 2 Runtime Environment, SE v1.4.0_01: security iossue, if you are using Java you need to update and keep it updated.

Not much else I can see, but I am betting there are programs there that are not used.

Logfile of HijackThis v1.99.1 Scan saved at 8:28:28 PM, on 12/3/2005
A couple of items I would question the need for them to be running everytime you boot:
O4 - HKLM\..\Run: [Advanced Tools Check] C:\PROGRA~1\NORTON~1\AdvTools\ADVCHK.EXE
http://castlecops.com/startuplist-145.html
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install <<< do you use this?http://castlecops.com/startuplist-2564.html

These are clutter and harmless except for there are not needed, and can be removed by HJT if you wish. If you remove them and they do not leave, it means one of your programs to block spyware is blocking the fix and needs to be turned off while you do it.
Open HijackThis and choose "Do a system scan only" then check the box in front of these line items:

O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - (no file
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - (no file)

Close all programs but HJT and all browser windows, then click on "Fix Checked"

Since this log appears clean of malware, here is some great information from Tony Klein, Texruss, ChrisRLG and Grinler to help you stay clean and safe online:
http://boards.cexx.org/viewtopic.php?t=957
http://russelltexas.com/malware/allclear.htm
http://forum.malwareremoval.com/viewtopic.php?t=14
http://www.bleepingcomputer.com/forums/topict2520.html

What I would like if you don't mind doing it, update your ewido scanner and scan using these instructions.
http://rstones12.geekstogo.com/ewidosetup.htm
Start with what you have not done. Run the scan removing items located by ewido unless you are unsure, then leave them and I will advise you. Make sure you save that FIRST scan result, that is the one I would like you to post for me to view.

Thanks…Phil