Re,
j'ai fait tout ce que tu m'as dit et je constate déjà une nette amélioration donc merci 
voilà ce que me donnent les rapports :
Adware:Adware/nCase No disinfected C:\Temp\FLEOK
Spyware:Spyware/ISTbar No disinfected Windows Registry
Spyware:Spyware/YourSiteBar No disinfected C:\RECYCLER\S-1-5-21-1677935863-14763043-87095681-1007\Dc2.exe
Adware:Adware/WinAD No disinfected C:\RECYCLER\S-1-5-21-1677935863-14763043-87095681-1007\Dc3.exe
Spyware:Spyware/YourSiteBar No disinfected C:\regular_plugin.exe
Adware:Adware/nCase No disinfected C:\temp\salm.log
Adware:Adware/nCase No disinfected C:\temp\salmau.dat
Adware:Adware/nCase No disinfected C:\temp\salm_gdf.dat
Adware:Adware/nCase No disinfected C:\temp\salm_kyf.dat
Logfile of HijackThis v1.99.1
Scan saved at 20:10:49, on 06/19/2005
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\csrss.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\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\CA\eTrust Antivirus\InoRpc.exe
C:\Program Files\CA\eTrust Antivirus\InoRT.exe
C:\Program Files\CA\eTrust Antivirus\InoTask.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\Program Files\Inventel\Add-on\wlancfg.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\RunDll32.exe
C:\WINDOWS\AGRSMMSG.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\WINDOWS\Dit.exe
C:\WINDOWS\zHotkey.exe
C:\Program Files\Home Cinema\PowerCinema\PCMService.exe
C:\PROGRA~1\CA\ETRUST~1\realmon.exe
C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\WINDOWS\system32\ctfmon.exe
C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
C:\Program Files\Webroot\Spy Sweeper\WRSSSDK.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\WINDOWS\system32\NOTEPAD.EXE
C:\hijackthis\hijackthis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.fr/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.carrefour.fr/
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.carrefour.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O4 - HKLM\..\Run: [Cmaudio] RunDll32 cmicnfg.cpl,CMICtrlWnd
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [Dit] Dit.exe
O4 - HKLM\..\Run: [CHotkey] zHotkey.exe
O4 - HKLM\..\Run: [PCMService] "C:\Program Files\Home Cinema\PowerCinema\PCMService.exe"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [AntivirusRegistration] c:\program files\antivirus offer\etrust antivirus registration\EzAntivirusRegistrationCheck.exe
O4 - HKLM\..\Run: [Realtime Monitor] C:\PROGRA~1\CA\ETRUST~1\realmon.exe -s
O4 - HKLM\..\Run: [SpySweeper] "C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe" /startintray
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_02\bin\npjpi150_02.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_02\bin\npjpi150_02.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
O14 - IERESET.INF: START_PAGE_URL=http://www.carrefour.fr/
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft. [...] 6144136156
O16 - DPF: {9A9307A0-7DA4-4DAF-B042-5009F29E09E1} (ActiveScan Installer Class) - http://www.pandasoftware.com/activescan/as5/asinst.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/ [...] loader.cab
O23 - Service: eTrust Antivirus RPC Server (InoRPC) - Computer Associates International, Inc. - C:\Program Files\CA\eTrust Antivirus\InoRpc.exe
O23 - Service: eTrust Antivirus Realtime Server (InoRT) - Computer Associates International, Inc. - C:\Program Files\CA\eTrust Antivirus\InoRT.exe
O23 - Service: eTrust Antivirus Job Server (InoTask) - Computer Associates International, Inc. - C:\Program Files\CA\eTrust Antivirus\InoTask.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Webroot Spy Sweeper Engine (svcWRSSSDK) - Webroot Software, Inc. - C:\Program Files\Webroot\Spy Sweeper\WRSSSDK.exe
O23 - Service: Service de lancement de WlanCfg (Wlancfg) - Inventel - C:\Program Files\Inventel\Add-on\wlancfg.exe
O23 - Service: X10 Device Network Service (x10nets) - X10 - C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
