Mechant virus!!!

bonjour a tous,
apres 4 reinstall de windows XP version1,j'ai toujours le pc qui semble tres tres lent,je n'ai plus parfois la connexion avec internet,parfois je n'ai plus les droits administrateur etc etc!!!!!
si quelqu'un peut regarder et me dire ce qu'a mon pc,je le remercie par avance!!!!!

Logfile of HijackThis v1.99.1
Scan saved at 16:18:11, on 06/10/2005
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\spoolsv.exe
C:\Program Files\Fichiers communs\Softwin\BitDefender Communicator\xcommsvr.exe
C:\Program Files\Fichiers communs\Softwin\BitDefender Scan Server\bdss.exe
C:\Program Files\Fichiers communs\Softwin\BitDefender Update Service\livesrv.exe
C:\Program Files\Softwin\BitDefender9\vsserv.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\Softwin\BITDEF~1\bdmcon.exe
C:\Program Files\Softwin\BitDefender9\bdoesrv.exe
C:\PROGRA~1\Softwin\BITDEF~1\bdnagent.exe
C:\PROGRA~1\Softwin\BITDEF~1\bdswitch.exe
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\cmd.exe
C:\Documents and Settings\fkry\Local Settings\Temp\Répertoire temporaire 2 pour hijackthis_199.zip\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O4 - HKLM\..\Run: [BDMCon] C:\PROGRA~1\Softwin\BITDEF~1\bdmcon.exe
O4 - HKLM\..\Run: [BDOESRV] "C:\Program Files\Softwin\BitDefender9\bdoesrv.exe"
O4 - HKLM\..\Run: [BDNewsAgent] "C:\PROGRA~1\Softwin\BITDEF~1\bdnagent.exe"
O4 - HKLM\..\Run: [BDSwitchAgent] "C:\PROGRA~1\Softwin\BITDEF~1\bdswitch.exe"
O4 - HKLM\..\Run: [Windows Update System Shell] svhostcs32.exe
O4 - HKLM\..\RunServices: [Windows Update System Shell] svhostcs32.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [Windows Update System Shell] svhostcs32.exe
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: 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
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O9 - Extra 'Tools' menuitem: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\MSMSGS.EXE
O23 - Service: BitDefender Scan Server (bdss) - Unknown owner - C:\Program Files\Fichiers communs\Softwin\BitDefender Scan Server\bdss.exe" /service (file missing)
O23 - Service: BitDefender Desktop Update Service (LIVESRV) - Unknown owner - C:\Program Files\Fichiers communs\Softwin\BitDefender Update Service\livesrv.exe" /service (file missing)
O23 - Service: BitDefender Virus Shield (VSSERV) - Unknown owner - C:\Program Files\Softwin\BitDefender9\vsserv.exe" /service (file missing)
O23 - Service: BitDefender Communicator (XCOMM) - Unknown owner - C:\Program Files\Fichiers communs\Softwin\BitDefender Communicator\xcommsvr.exe" /service (file missing)