Rapport hijackthis

Bonjour,

Ca fait quelques tps que je mon PC rame à cause de multiple Virus ...;

Apres avoir essayé plusieurs antivirus, je viens d'installer Norton. Ca marche légerement mieux sauf que des que je raccorde mon PC au réseau, ça rame comme pas permis.

Est-ce que celà peut venir d'un virus ou bien d'un probleme maatériel ?
Voici un rapport hijackthis, si quelqu'un peut m'aider.
Merci d'avance

Logfile of HijackThis v1.99.1
Scan saved at 19:40:06, on 18/03/2008
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:\Program Files\Fichiers communs\Symantec Shared\ccSvcHst.exe
C:\WINDOWS\Explorer.exe
C:\Program Files\Fichiers communs\Symantec Shared\AppCore\AppSvc32.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
C:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Acrobat 6.0\Distillr\acrotray.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe
C:\Program Files\Outlook Express\msimn.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\histoire.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F2 - REG:system.ini: Shell=Explorer.exe %WINDIR%\pdf.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Acrobat 6.0\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: AcroIEToolbarHelper Class - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Program Files\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Program Files\Acrobat 6.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\System32\\NeroCheck.exe
O4 - HKLM\..\Run: [9c270b4c] rundll32.exe "C:\WINDOWS\System32\gkecpaxw.dll",b
O4 - HKLM\..\Run: [ccApp] "C:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [osCheck] "C:\Program Files\Norton AntiVirus\osCheck.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - Global Startup: Assistant d'Acrobat.lnk = C:\Program Files\Acrobat 6.0\Distillr\acrotray.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {85d1f590-48f4-11d9-9669-0800200c9a66} - %windir%\bdoscandel.exe (file missing)
O9 - Extra 'Tools' menuitem: Uninstall BitDefender Online Scanner v8 - {85d1f590-48f4-11d9-9669-0800200c9a66} - %windir%\bdoscandel.exe (file missing)
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.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
O16 - DPF: {104B0A37-AB99-4F06-8032-8BBDC3B77DDB} (Telechargement Control) - http://www.photoweb.fr/moncompte/Account/LogOn?ReturnUrl=%2ftransfert
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://download.microsoft.com/download/E/5/6/E5611B10-0D6D-4117-8430-A67417AA88CD/LegitCheckControl.cab
O16 - DPF: {5D86DDB5-BDF9-441B-9E9E-D4730F4EE499} (BDSCANONLINE Control) - http://www.bitdefender.fr/scan_fr/scan8/oscan8.cab
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\
O23 - Service: Acronis Scheduler_Helper - Unknown owner - C:\WINDOWS\schedhlp.exe (file missing)
O23 - Service: Symantec Event Manager (ccEvtMgr) - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: Symantec Settings Manager (ccSetMgr) - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: Symantec Lic NetConnect service (CLTNetCnService) - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\ccSvcHst.exe" /h ccCommon (file missing)
O23 - Service: Validation de mot de passe Symantec IS (ISPwdSvc) - Symantec Corporation - C:\Program Files\Norton AntiVirus\isPwdSvc.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: Messenger Updat - Unknown owner - C:\WINDOWS\System32\dllcache\msnmsgr.exe (file missing)
O23 - Service: Microsoft Agent - Unknown owner - C:\WINDOWS\System32\dllcache\mswords.exe (file missing)
O23 - Service: Microsoft PowerPoint Application - Unknown owner - C:\WINDOWS\System32\dllcache\winppa.exe (file missing)
O23 - Service: Microsoft Windows TCP Protocol - Unknown owner - C:\WINDOWS\System32\dllcache\wintcps.exe (file missing)
O23 - Service: Planificateur LiveUpdate automatique - Symantec Corporation - C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSvc.exe
O23 - Service: Print2Email - Unknown owner - C:\WINDOWS\pdf.exe (file missing)
O23 - Service: Scanning Analist Management System (SAMS) - Unknown owner - C:\WINDOWS\System32\sams.exe (file missing)
O23 - Service: Sunbelt Personal Firewall 4 (SPF4) - Sunbelt Software - C:\Program Files\Sunbelt Software\Personal Firewall\kpf4ss.exe
O23 - Service: Symantec Core LC - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\CCPD-LC\symlcsvc.exe
O23 - Service: Symantec AppCore Service (SymAppCore) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\AppCore\AppSvc32.exe