Virus Antivirus 2009

Bonjour,
j'ai un virus depuis plusieurs jours. J'ai téléchargé hijackthis suite à vos conseils sur un forum.
Je vous poste ci-dessous le rapport.
Pouvez-vous m'aider à solutionner le problème ?
Merci.
Loulou

===============================================
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 16:59:43, on 29/12/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
Boot mode: Normal

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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\F-Secure\Anti-Virus\fsgk32st.exe
C:\Program Files\F-Secure\Common\FSMA32.EXE
C:\Program Files\F-Secure\Anti-Virus\FSGK32.EXE
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\lxdnserv.exe
C:\WINDOWS\system32\lxdncoms.exe
C:\Program Files\F-Secure\Common\FSMB32.EXE
C:\Program Files\F-Secure\Common\FCH32.EXE
C:\Program Files\SPAMfighter\sfus.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\F-Secure\Common\FSM32.EXE
C:\Program Files\SPAMfighter\SFAgent.exe
C:\Program Files\Lexmark 2600 Series\lxdnmon.exe
C:\Program Files\Lexmark 2600 Series\ezprint.exe
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Cegetel\C-BOX\Wizard\QuickAccess.exe
C:\Program Files\Windows Live\Messenger\MsnMsgr.Exe
C:\Program Files\F-Secure\Common\FAMEH32.EXE
C:\Program Files\F-Secure\Anti-Virus\fsqh.exe
C:\Program Files\F-Secure\FSGUI\fsguidll.exe
C:\Program Files\F-Secure\Common\FNRB32.EXE
C:\Program Files\F-Secure\Anti-Virus\fssm32.exe
C:\Program Files\F-Secure\FSAUA\program\fsaua.exe
C:\Program Files\F-Secure\FWES\Program\fsdfwd.exe
C:\Program Files\F-Secure\Common\FIH32.EXE
C:\Program Files\F-Secure\Anti-Virus\fsav32.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.sfr.fr/
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
O2 - BHO: (no name) - {4c50634c-8ba1-417b-9f5d-4cfb2cd797aa} - C:\WINDOWS\system32\yumuyofu.dll (file missing)
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O3 - Toolbar: Barre d'outils MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar\01.01.2607.0\fr\msntb.dll
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\System32\NeroCheck.exe
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [F-Secure Manager] "C:\Program Files\F-Secure\Common\FSM32.EXE" /splash
O4 - HKLM\..\Run: [F-Secure TNB] "C:\Program Files\F-Secure\FSGUI\TNBUtil.exe" /CHECKALL /WAITFORSW
O4 - HKLM\..\Run: [SPAMfighter Agent] "C:\Program Files\SPAMfighter\SFAgent.exe" update delay 60
O4 - HKLM\..\Run: [lxdnmon.exe] "C:\Program Files\Lexmark 2600 Series\lxdnmon.exe"
O4 - HKLM\..\Run: [EzPrint] "C:\Program Files\Lexmark 2600 Series\ezprint.exe"
O4 - HKLM\..\Run: [letonewoba] Rundll32.exe "C:\WINDOWS\system32\gewugimo.dll",s
O4 - HKLM\..\Run: [d042757b] rundll32.exe "C:\WINDOWS\system32\gumapoke.dll",b
O4 - HKLM\..\Run: [CPMd37146e7] Rundll32.exe "c:\windows\system32\muhodogu.dll",a
O4 - HKCU\..\Run: [Configuration de la C-BOX] C:\Program Files\Cegetel\C-BOX\Wizard\QuickAccess.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\Windows Live\Messenger\MsnMsgr.Exe" /background
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\Run: [letonewoba] Rundll32.exe "C:\WINDOWS\system32\gewugimo.dll",s (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\System32\CTFMON.EXE (User 'Default user')
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
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
O20 - AppInit_DLLs: C:\WINDOWS\system32\ledamine.dll c:\windows\system32\muhodogu.dll
O21 - SSODL: SSODL - {EC43E3FD-5C60-46a6-97D7-E0B85DBDD6C4} - c:\windows\system32\muhodogu.dll
O22 - SharedTaskScheduler: STS - {EC43E3FD-5C60-46a6-97D7-E0B85DBDD6C4} - c:\windows\system32\muhodogu.dll
O23 - Service: FSGKHS (F-Secure Gatekeeper Handler Starter) - F-Secure Corporation - C:\Program Files\F-Secure\Anti-Virus\fsgk32st.exe
O23 - Service: F-Secure Network Request Broker - F-Secure Corporation - C:\Program Files\F-Secure\Common\FNRB32.EXE
O23 - Service: F-Secure Automatic Update Agent (FSAUA) - F-Secure Corporation - C:\Program Files\F-Secure\FSAUA\program\fsaua.exe
O23 - Service: F-Secure Anti-Virus Firewall Daemon (FSDFWD) - F-Secure Corporation - C:\Program Files\F-Secure\FWES\Program\fsdfwd.exe
O23 - Service: F-Secure Management Agent (FSMA) - F-Secure Corporation - C:\Program Files\F-Secure\Common\FSMA32.EXE
O23 - Service: lxdnCATSCustConnectService - Lexmark International, Inc. - C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\\lxdnserv.exe
O23 - Service: lxdn_device - - C:\WINDOWS\system32\lxdncoms.exe
O23 - Service: SPAMfighter Update Service - SPAMfighter ApS - C:\Program Files\SPAMfighter\sfus.exe