Bonjour,
J'ai tout téléchargé (bêtement...) Devais-je exécuter tous ces programmes ? Dans le doute je ne l'ai pas fait. Voici le rapport de HijackThis.
Merci de ton aide.

Logfile of HijackThis v1.99.1
Scan saved at 11:06:49, on 18/02/2006
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:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\CTsvcCDA.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\wanmpsvc.exe
C:\WINDOWS\System32\MsPMSPSv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\BCMSMMSG.exe
C:\WINDOWS\system32\dla\tfswctrl.exe
C:\Program Files\Dell\Media Experience\PCMService.exe
C:\WINDOWS\System32\DSentry.exe
C:\Program Files\Creative\SBLive\Diagnostics\diagent.exe
C:\Program Files\Dell AIO Printer A940\dlbabmgr.exe
C:\Program Files\Dell AIO Printer A940\dlbabmon.exe
C:\PROGRA~1\Wanadoo\TaskbarIcon.exe
C:\Program Files\Real\RealPlayer\RealPlay.exe
C:\Program Files\Kodak Digital Science\Logiciel Photo Facile\Program\PezDownload.exe
C:\WINDOWS\vsnpstd.exe
C:\Program Files\HbTools\Bin\4.7.1.0\HbtWeatherOnTray.exe
C:\Program Files\HbTools\Bin\4.7.1.0\HbtOEAddOn.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\HbTools\Bin\4.7.1.0\HbtSrv.exe
C:\Program Files\Windows Media Player\wmplayer.exe
C:\HijackThis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.euro.dell.com/countries/fr/fra/gen/default.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.euro.dell.com/countries/fr/fra/gen/default.htm
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://resultsmaster.com/SmartOffers/Services/resultsmaster/ResultsMasterHomeLeftPane.htm
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Wanadoo
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: ShprRprts - {2A8A997F-BB9F-48F6-AA2B-2762D50F9289} - C:\Program Files\ShopperReports\Bin\1.0.8.0\ShprRprt.dll
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\system32\dla\tfswshx.dll
O2 - BHO: HbTools - {74CC49F7-EB32-4A08-B204-948962A6E3DB} - C:\Program Files\HbTools\Bin\4.7.1.0\HbtHostIE.dll
O3 - Toolbar: H&otbar - {74CC49F7-EB32-4A08-B204-948962A6E3DB} - C:\Program Files\HbTools\Bin\4.7.1.0\HbtHostIE.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [BCMSMMSG] BCMSMMSG.exe
O4 - HKLM\..\Run: [diagent] "C:\Program Files\Creative\SBLive\Diagnostics\diagent.exe" startup
O4 - HKLM\..\Run: [UpdReg] C:\WINDOWS\UpdReg.EXE
O4 - HKLM\..\Run: [dla] C:\WINDOWS\system32\dla\tfswctrl.exe
O4 - HKLM\..\Run: [StorageGuard] "C:\Program Files\Fichiers communs\Sonic\Update Manager\sgtray.exe" /r
O4 - HKLM\..\Run: [PCMService] "C:\Program Files\Dell\Media Experience\PCMService.exe"
O4 - HKLM\..\Run: [DVDSentry] C:\WINDOWS\System32\DSentry.exe
O4 - HKLM\..\Run: [Dell AIO Printer A940] "C:\Program Files\Dell AIO Printer A940\dlbabmgr.exe"
O4 - HKLM\..\Run: [WOOWATCH] C:\PROGRA~1\Wanadoo\Watch.exe
O4 - HKLM\..\Run: [WOOTASKBARICON] C:\PROGRA~1\Wanadoo\TaskbarIcon.exe
O4 - HKLM\..\Run: [RealTray] C:\Program Files\Real\RealPlayer\RealPlay.exe SYSTEMBOOTHIDEPLAYER
O4 - HKLM\..\Run: [Picture Easy Download] C:\Program Files\Kodak Digital Science\Logiciel Photo Facile\Program\PezDownload.exe
O4 - HKLM\..\Run: [snpstd] C:\WINDOWS\vsnpstd.exe
O4 - HKLM\..\Run: [WeatherOnTray] C:\Program Files\HbTools\Bin\4.7.1.0\HbtWeatherOnTray.exe
O4 - HKLM\..\Run: [HbTools] C:\Program Files\HbTools\Bin\4.7.1.0\HbtOEAddOn.exe
O4 - HKLM\..\Run: [rrppetao] C:\WINDOWS\system32\hhsmgqvx.exe
O4 - HKLM\..\Run: [KAVPersonal50] "C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal\kav.exe" /minimize
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\Run: [WinFixer 2005] C:\Program Files\WinFixer 2005\uwfx5.exe /scan
O4 - HKCU\..\Run: [WinFixer2005] "C:\Program Files\WinFixer 2005\uwfx5.exe" /scan
O4 - Global Startup: AOL 8.0 Icône AOL.lnk = C:\Program Files\AOL 8.0\aoltray.exe
O4 - Global Startup: AOL Compagnon.lnk = C:\Program Files\AOL Compagnon\companion.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~4\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll (file missing)
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll (file missing)
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~4\OFFICE11\REFIEBAR.DLL
O9 - Extra button: ShopperReports - Compare travel rates - {946B3E9E-E21A-49c8-9F63-900533FAFE14} - C:\Program Files\ShopperReports\Bin\1.0.8.0\ShprRprt.dll
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\System32\Shdocvw.dll
O9 - Extra button: ShopperReports - Compare product prices - {E77EDA01-3C56-4a96-8D08-02B42891C169} - C:\Program Files\ShopperReports\Bin\1.0.8.0\ShprRprt.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: {2917297F-F02B-4B9D-81DF-494B6333150B} (Minesweeper Flags Class) - http://messenger.zone.msn.com/binary/MineSweeper.cab31267.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.com/v5consumer/V5Controls/en/x86/client/wuweb_site.cab?1107590386937
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsClient.cab31267.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/MsnMessengerSetupDownloader.cab
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: Creative Service for CDROM Access - Creative Technology Ltd - C:\WINDOWS\System32\CTsvcCDA.exe
O23 - Service: kavsvc - Kaspersky Lab - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal\kavsvc.exe
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: Intel NCS NetService (NetSvc) - Intel(R) Corporation - C:\Program Files\Intel\NCS\Sync\NetSvc.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Sony SPTI Service (SPTISRV) - Sony Corporation - C:\Program Files\Fichiers communs\Sony Shared\AVLib\Sptisrv.exe
O23 - Service: WAN Miniport (ATW) Service (WANMiniportService) - America Online, Inc. - C:\WINDOWS\wanmpsvc.exe