Virus

Bonjour,
j'ai un virus sur mon ordinateur, avast arrive à le détecter mais n'arrive ni à le mettre en quarantaine, ni à le suuprimer!
le pc devient de p,us en plus lent! que dois-je faire?
voici l rapport HiJackthis:
Logfile of HijackThis v1.99.1
Scan saved at 23:08:24, on 06/03/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
E:\WINDOWS\System32\smss.exe
E:\WINDOWS\system32\winlogon.exe
E:\WINDOWS\system32\services.exe
E:\WINDOWS\system32\lsass.exe
E:\WINDOWS\system32\svchost.exe
E:\WINDOWS\system32\svchost.exe
E:\WINDOWS\Explorer.EXE
E:\Documents and Settings\DLALA\Bureau\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: Yahoo! Toolbar avec bloqueur de fenêtres pop-up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - (no file)
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - E:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: Skype add-on (mastermind) - {22BF413B-C6D2-4d91-82A9-A0F997BA588C} - E:\PROGRA~1\Skype\Phone\IEPlugin\SKYPEI~1.DLL
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - E:\Program Files\Java\jre1.5.0_11\bin\ssv.dll
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - E:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O3 - Toolbar: (no name) - {b5146c40-189a-4311-bda9-fbae3e023187} - (no file)
O4 - HKLM\..\Run: [IMJPMIG8.1] "E:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - HKLM\..\Run: [PHIME2002ASync] E:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - HKLM\..\Run: [PHIME2002A] E:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - HKLM\..\Run: [avast!] E:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [HP Software Update] E:\Program Files\HP\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [NeroFilterCheck] E:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [WinampAgent] E:\Program Files\Winamp\winampa.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] E:\Program Files\Java\jre1.5.0_11\bin\jusched.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE E:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE E:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "E:\Program Files\Fichiers communs\Ahead\lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [swg] E:\Program Files\Google\GoogleToolbarNotifier\1.2.1128.5462\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [MSMSGS] "E:\Program Files\Messenger\msmsgs.exe" /background
O4 - Global Startup: Utilitaire réseau pour SAGEM Wi-Fi 11g USB adapter.lnk = ?
O4 - Global Startup: HP Digital Imaging Monitor.lnk = E:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
O4 - Global Startup: WinZip Quick Pick.lnk = E:\Program Files\WinZip\WZQKPICK.EXE
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = E:\Program Files\Adobe\Reader 8.0\Reader\reader_sl.exe
O4 - Global Startup: Adobe Reader Synchronizer.lnk = E:\Program Files\Adobe\Reader 8.0\Reader\AdobeCollabSync.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = E:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: AutoCAD Startup Accelerator.lnk = E:\Program Files\Fichiers communs\Autodesk Shared\acstart16.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://E:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - E:\Program Files\Java\jre1.5.0_11\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - E:\Program Files\Java\jre1.5.0_11\bin\ssv.dll
O9 - Extra button: Skype - {77BF5300-1474-4EC7-9980-D32B190E9B07} - E:\PROGRA~1\Skype\Phone\IEPlugin\SKYPEI~1.DLL
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - E:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - E:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - E:\Program Files\Messenger\msmsgs.exe
O15 - Trusted Zone: *.line6.net
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - E:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - E:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - E:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: WgaLogon - E:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - E:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - E:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Autodesk Licensing Service - Autodesk - E:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: avast! Antivirus - ALWIL Software - E:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - E:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - E:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - E:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - E:\WINDOWS\system32\HPZipm12.exe
O23 - Service: SmartLinkService (SLService) - Smart Link - E:\WINDOWS\SYSTEM32\slserv.exe

Configuration: Windows XP
Internet Explorer 7.0