voilà ce qu'on a sur le logfile:
Logfile of HijackThis v1.99.1
Scan saved at 16:26:16, on 23/01/2008
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\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Fichiers communs\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\AntiVir PersonalEdition Premium\sched.exe
C:\Program Files\AntiVir PersonalEdition Premium\avesvc.exe
C:\Program Files\AntiVir PersonalEdition Premium\avmailc.exe
C:\Program Files\AntiVir PersonalEdition Premium\avguard.exe
C:\Program Files\AntiVir PersonalEdition Premium\avgnt.exe
C:\Program Files\AntiVir PersonalEdition Premium\avcenter.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Hij\PC HijackThis\HijackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O3 - Toolbar: &Netcraft Toolbar - {D554D8FC-B36D-4BB4-93DB-4A3394D505E3} - C:\Program Files\Netcraft Toolbar\nctb.dll
O4 - HKLM\..\Run: [avgnt] "C:\Program Files\AntiVir PersonalEdition Premium\avgnt.exe" /min
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.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
O10 - Broken Internet access because of LSP provider 'avsda.dll' missing
O17 - HKLM\System\CCS\Services\Tcpip\..\{8A6E0EA3-0854-4DA2-B679-2455E1DA08BF}: Domain = malagasy.com
O17 - HKLM\System\CCS\Services\Tcpip\..\{8A6E0EA3-0854-4DA2-B679-2455E1DA08BF}: NameServer = 62.56.240.40,62.56.33.162
O23 - Service: AntiVir PersonalEdition Premium MailGuard (AntiVirMailService) - Avira GmbH - C:\Program Files\AntiVir PersonalEdition Premium\avmailc.exe
O23 - Service: AntiVir PersonalEdition Premium Scheduler (AntiVirScheduler) - Avira GmbH - C:\Program Files\AntiVir PersonalEdition Premium\sched.exe
O23 - Service: AntiVir PersonalEdition Premium Guard (AntiVirService) - AVIRA GmbH - C:\Program Files\AntiVir PersonalEdition Premium\avguard.exe
O23 - Service: AntiVir PersonalEdition Premium MailGuard helper service (AVEService) - Avira GmbH - C:\Program Files\AntiVir PersonalEdition Premium\avesvc.exe
O23 - Service: TuneUp Drive Defrag Service (Beta) (TuneUp.Defrag) - TuneUp Software GmbH - C:\WINDOWS\System32\TuneUpDefragService.exe