Hi!!!
My desktop is very old (2003), and I've never done a complete cleaning of it. I suspect it has some viruses and it might be full of malaware, etc. becasue is really slow.
THANKS!!! ;)

This is my HJT log:

Logfile of HijackThis v1.99.1
Scan saved at 10:31:27 AM, on 6/17/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16674)

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\logishrd\lvmvfm\LVPrcSrv.exe
C:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
C:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
C:\Program Files\Roxio\GoBack\GBPoll.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Sony\VAIO Media Music Server\SSSvr.exe
C:\Program Files\Sony\Photo Server 20\appsrv\PicAppSrv.exe
C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\SV_Httpd.exe
C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\sv_httpd.exe
C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\UPnPFramework.exe
C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\UPnPFramework.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\ezSP_Px.exe
C:\Program Files\USB FlashDisk\UFD Utility 2003\ufdlmon.exe
C:\Program Files\USB FlashDisk\UFD Utility 2003\UFDTool.exe
C:\PROGRA~1\Grisoft\AVG7\avgcc.exe
C:\Program Files\Logitech\QuickCam10\QuickCam10.exe
C:\Program Files\Java\jre1.6.0_05\bin\jusched.exe
C:\Program Files\Common Files\LogiShrd\LComMgr\Communications_Helper.exe
C:\Program Files\FastAccessDSL\HelpCenter43\bin\sprtcmd.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Logitech\MouseWare\system\em_exec.exe
C:\Program Files\Common Files\LogiShrd\LComMgr\LVComSX.exe
C:\PROGRA~1\Grisoft\AVG7\avgw.exe
C:\Program Files\Common Files\Logishrd\LQCVFX\COCIManager.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Common Files\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Documents and Settings\GEORGE\Local Settings\Temporary Internet Files\Content.IE5\JLK6AFZX\AntvrsInstall[1].exe
C:\Hijackthis\HijackThis.exe

R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R3 - URLSearchHook: (no name) - {CFBFAE00-17A6-11D0-99CB-00C04FD64497}_ - (no file)
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: Lexico Toolbar - {11359F4A-B191-42d7-905A-594F8CF0387B} - (no file)
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Program Files\Canon\Easy-WebPrint\Toolband.dll
O4 - HKLM\..\Run: [SiSUSBRG] C:\WINDOWS\SiSUSBrg.exe
O4 - HKLM\..\Run: [ezShieldProtector for Px] C:\WINDOWS\System32\ezSP_Px.exe
O4 - HKLM\..\Run: [UFD Monitor9382] C:\Program Files\USB FlashDisk\UFD Utility 2003\ufdlmon.exe
O4 - HKLM\..\Run: [UFD Utility9382] C:\Program Files\USB FlashDisk\UFD Utility 2003\UFDTool.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [AVG7_CC] C:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [LogitechQuickCamRibbon] "C:\Program Files\Logitech\QuickCam10\QuickCam10.exe" /hide
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_05\bin\jusched.exe"
O4 - HKLM\..\Run: [LogitechCommunicationsManager] "C:\Program Files\Common Files\LogiShrd\LComMgr\Communications_Helper.exe"
O4 - HKLM\..\Run: [HelpCenter4.1] C:\Program Files\FastAccessDSL\HelpCenter43\bin\sprtcmd.exe /P HelpCenter4.1
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Uniblue RegistryBooster 2] C:\Program Files\Uniblue\RegistryBooster 2\RegistryBooster.exe /S
O8 - Extra context menu item: E&xport to Microsoft Excel - res://D:\MICROS~1\OFFICE11\EXCEL.EXE/3000
O8 - Extra context menu item: Easy-WebPrint Add To Print List - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Easy-WebPrint High Speed Print - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Easy-WebPrint Preview - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
O8 - Extra context menu item: Easy-WebPrint Print - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_05\bin\ssv.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - D:\MICROS~1\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
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
O10 - Broken Internet access because of LSP provider 'c:\program files\newdotnet\newdotnet4_88.dll' missing
O11 - Options group: [INTERNATIONAL] International*
O14 - IERESET.INF: START_PAGE_URL=http://www.sony.com/vaiopeople
O15 - Trusted Zone: http://www.medscape.com
O16 - DPF: ConferenceRoom Java Client - http://chat.colombia.com/java/cr.cab
O16 - DPF: Yahoo! Chess - http://download.games.yahoo.com/games/clients/y/ct1_x.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://by132fd.bay132.hotmail.msn.com/resources/MsnPUpld.cab
O16 - DPF: {5C6698D9-7BE4-4122-8EC5-291D84DBD4A0} (Facebook Photo Uploader 4 Control) - http://upload.facebook.com/controls/Facebo…toUploader2.cab
O16 - DPF: {5F8469B4-B055-49DD-83F7-62B522420ECC} (Facebook Photo Uploader Control) - http://upload.facebook.com/controls/Facebo…otoUploader.cab
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://update.microsoft.com/microsoftupdat…b?1181180208156
O16 - DPF: {6F15128C-E66A-490C-B848-5000B5ABEEAC} (HP Download Manager) - https://h20436.www2.hp.com/ediags/dex/secure/HPDEXAXO.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
O19 - User stylesheet: (file missing) (HKLM)
O20 - Winlogon Notify: NavLogon - C:\WINDOWS\
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
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: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - C:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: GBPoll - Roxio, Inc. - C:\Program Files\Roxio\GoBack\GBPoll.exe
O23 - Service: Process Monitor (LVPrcSrv) - Logitech Inc. - c:\program files\common files\logishrd\lvmvfm\LVPrcSrv.exe
O23 - Service: LVSrvLauncher - Logitech Inc. - C:\Program Files\Common Files\LogiShrd\SrvLnch\SrvLnch.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\PROGRA~1\COMMON~1\SONYSH~1\AVLib\Sptisrv.exe
O23 - Service: VAIO Media Music Server (Application) (VAIOMediaPlatform-MusicServer-AppServer) - Unknown owner - C:\Program Files\Sony\VAIO Media Music Server\SSSvr.exe" /Service=VAIOMediaPlatform-MusicServer-AppServer /DisplayName="VAIO Media Music Server (Application) (file missing)
O23 - Service: VAIO Media Music Server (HTTP) (VAIOMediaPlatform-MusicServer-HTTP) - Unknown owner - C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\sv_httpd.exe" /Service=VAIOMediaPlatform-MusicServer-HTTP /RegRoot="Software\Sony Corporation\VAIO Media Platform\2.0" /RegExt="Applications\MusicServer\HTTP (file missing)
O23 - Service: VAIO Media Music Server (UPnP) (VAIOMediaPlatform-MusicServer-UPnP) - Sony Corporation - C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\UPnPFramework.exe
O23 - Service: VAIO Media Photo Server (Application) (VAIOMediaPlatform-PhotoServer-AppServer) - Unknown owner - C:\Program Files\Sony\Photo Server 20\appsrv\PicAppSrv.exe
O23 - Service: VAIO Media Photo Server (HTTP) (VAIOMediaPlatform-PhotoServer-HTTP) - Unknown owner - C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\SV_Httpd.exe" /Service=VAIOMediaPlatform-PhotoServer-HTTP /RegRoot="Software\Sony Corporation\VAIO Media Platform\2.0" /RegExt="\Applications\PhotoServer\HTTP (file missing)
O23 - Service: VAIO Media Photo Server (UPnP) (VAIOMediaPlatform-PhotoServer-UPnP) - Sony Corporation - C:\Program Files\Common Files\Sony Shared\VAIO Media Platform\UPnPFramework.exe