Hello:
I've came here some days ago with the problem of the computer freezing up.
I did all the work you asked me and did also a onecare.live.com analist scan from the microsoft. It took several hours, to clean, to defrag, and more. I've bought a new memory (256 Mb) to add to the one I add. Still, the computer freezes up and now I really don´'t know what to do more. Please, be patient with me to come here again..

here is the hijackthis log:

Logfile of HijackThis v1.99.1
Scan saved at 12:02:26, on 16-09-2007
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\ZoneLabs\vsmon.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Programas\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\Programas\Ficheiros comuns\Microsoft Shared\VS7Debug\mdm.exe
C:\WINDOWS\system32\WgaTray.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIACE.EXE
C:\Programas\Zone Labs\ZoneAlarm\zlclient.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\Programas\nwsp\pf\Pf.exe
C:\Programas\iTunes\iTunesHelper.exe
C:\Programas\iPod\bin\iPodService.exe
C:\Programas\Internet Explorer\iexplore.exe
C:\Programas\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
C:\Programas\Java\jre1.6.0_02\bin\jusched.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Programas\nwsp\pf\PfNetwork.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Programas\Messenger\msmsgs.exe
C:\Programas\RamBooster 2.0\Rambooster.exe
C:\Hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.pt/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\Userinit.exe
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Programas\Java\jre1.6.0_02\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: EpsonToolBandKicker Class - {E99421FB-68DD-40F0-B4AC-B7027CAE2F1A} - C:\Programas\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O3 - Toolbar: EPSON Web-To-Page - {EE5D279F-081B-4404-994D-C6B60AAEBA6D} - C:\Programas\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [EPSON Stylus DX3800 Series] "C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATIACE.EXE" /P26 "EPSON Stylus DX3800 Series" /O6 "USB001" /M "Stylus DX3800"
O4 - HKLM\..\Run: [Zone Labs Client] "C:\Programas\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [ParentalFilter] C:\Programas\nwsp\pf\Pf.exe
O4 - HKLM\..\Run: [iTunesHelper] "C:\Programas\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Programas\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Programas\Java\jre1.6.0_02\bin\jusched.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Programas\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [RamBooster] C:\Programas\RamBooster 2.0\Rambooster.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Programas\Ficheiros comuns\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Programas\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xportar para o Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programas\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Programas\Java\jre1.6.0_02\bin\ssv.dll
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programas\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Programas\Messenger\msmsgs.exe
O16 - DPF: {0E5F0222-96B9-11D3-8997-00104BD12D94} (PCPitstop Utility) - http://www.pcpitstop.com/pcpitstop/PCPitStop.CAB
O16 - DPF: {5ED80217-570B-4DA9-BF44-BE107C0EC166} (Windows Live Safety Center Base Module) - http://cdn.scan.onecare.live.com/resource/…lscbase8300.cab
O16 - DPF: {62789780-B744-11D0-986B-00609731A21D} (Autodesk MapGuide ActiveX Control) - http://images.autodesk.com/adsk/files/mgaxctrl.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMesse…pDownloader.cab
O16 - DPF: {DF780F87-FF2B-4DF8-92D0-73DB16A1543A} - http://download.games.yahoo.com/games/web_…aploader_v6.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHEI~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O20 - Winlogon Notify: WRNotifier - WRLogonNTF.dll (file missing)
O23 - Service: Adobe LM Service - Unknown owner - C:\Programas\Ficheiros comuns\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Programas\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Programas\Ficheiros comuns\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iPod Service - Apple Computer, Inc. - C:\Programas\iPod\bin\iPodService.exe
O23 - Service: Norman API-hooking helper (NipSvc) - Unknown owner - C:\VIRUSfighter\Nvc\BIN\nipsvc.exe (file missing)
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - C:\WINDOWS\system32\ZoneLabs\vsmon.exe

Thank you.