Aïe, si tu n'aime pas, alors je sens que je ne vais pas aimer non plus...
voila le log HJT, je n'ai pas encore passé CCleaner

Logfile of HijackThis v1.99.1
Scan saved at 21:52:16, on 21/11/2006
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\PROGRA~1\CA\ETRUST~1\ETRUST~1\VetTray.exe
C:\WINDOWS\system32\WF2K.EXE
C:\WINDOWS\soundman.exe
C:\WINDOWS\System32\RUNDLL32.EXE
C:\WINDOWS\System32\Windowsupfix.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\isafe.exe
E:\programmes\loisirs\steam.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\VetMsg.exe
C:\WINDOWS\explorer.exe
E:\PROGRA~1\UTILIT~1\FIREFO~1\FIREFOX.EXE
C:\HiJackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\PCHealth\HelpCtr\System\panels\blank.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - E:\Programmes\Utilitaires\accrobat reader\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O2 - BHO: (no name) - {E99421FB-68DD-40F0-B4AC-B7027CAE2F1A} - (no file)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\system32\msdxm.ocx
O4 - HKLM\..\Run: [VetTray] C:\PROGRA~1\CA\ETRUST~1\ETRUST~1\VetTray.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [WinFast_2K] C:\WINDOWS\system32\WF2K.EXE
O4 - HKLM\..\Run: [WinFast2KLoadDefault] rundll32.exe wf2kcpl.dll,DllLoadDefaultSettings
O4 - HKLM\..\Run: [SoundMan] soundman.exe
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [Creative WebCam Tray] C:\Program Files\Creative\Shared Files\CAMTRAY.EXE
O4 - HKLM\..\Run: [CTRegRun] C:\WINDOWS\CTRegRun.EXE
O4 - HKLM\..\Run: [Windows Update] Windowsupfix.exe
O4 - HKLM\..\RunServices: [Windows Update] Windowsupfix.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [Steam] "e:\programmes\loisirs\steam.exe" -silent
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NVMCTRAY.DLL,NvTaskbarInit
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = E:\Programmes\Utilitaires\accrobat reader\Reader\reader_sl.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://E:\PROGRA~1\UTILIT~1\msoffice\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O16 - DPF: {2917297F-F02B-4B9D-81DF-494B6333150B} (Minesweeper Flags Class) - http://messenger.zone.msn.com/binary/MineSweeper.cab31267.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: Autodesk Licensing Service - Autodesk, Inc. - C:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: CA ISafe (CAISafe) - Computer Associates International, Inc. - C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\isafe.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: NVIDIA Driver Helper Service (nvsvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: VET Message Service (VETMSGNT) - Computer Associates International, Inc. - C:\Program Files\CA\eTrust EZ Armor\eTrust EZ Antivirus\VetMsg.exe