Pb de fenêtres intempWinantivirus, cleaner...

Pb de fenêtre intempestives Winantirus, drive cleaner... Voici mon rapport, comment faire pour faire disparaitre cela.
Merci
Mon rapport Hijackthis:
Logfile of HijackThis v1.99.1
Scan saved at 17:09:10, on 31/03/2007
Platform: Windows XP (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 (6.00.2600.0000)

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\system\system.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Documents and Settings\scraps\Mes documents\hijackthis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [SoundService] rundll32.exe "C:\WINDOWS\System32\spjxfouo.dll",setvm
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - C:\Program Files\Fichiers communs\Symantec Shared\ccPwdSvc.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Unknown owner - C:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe (file missing)
O23 - Service: Windows System Service (SYSTEMSVC) - Unknown owner - C:\WINDOWS\system\system.exe