Impossible de travailler

Bonjour,

voila j'ai gros problème avec mon ordinateur
impossible de faire quoi que ce soit en le démarrant normalement et en mode sans échec avast me détecte à chaque scan quelque chose.

voila un scan hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 10:16:30, on 24.04.2009
Platform: Windows XP SP3, v.5755 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.21020)
Boot mode: Safe mode with network support

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:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

O2 - BHO: PCTools Site Guard - {5C8B2A36-3DB1-42A4-A3CB-D426709BBFEB} - C:\DOCUME~1\ADMINI~1\Bureau\PROG_P~1\MOSTWA~1\SPYWAR~1\tools\iesdsg.dll
O2 - BHO: PCTools Browser Monitor - {B56A7D7D-6927-48C8-A975-17DF180C71AC} - C:\DOCUME~1\ADMINI~1\Bureau\PROG_P~1\MOSTWA~1\SPYWAR~1\tools\iesdpb.dll
O4 - HKLM\..\Run: [egui] "C:\Program Files\ESET\ESET NOD32 Antivirus\egui.exe" /hide /waitservice
O4 - HKLM\..\Run: [Athan] C:\Program Files\Athan\Athan.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O9 - Extra button: Spyware Doctor - {2D663D1A-8670-49D9-A1A5-4C56B4E14E84} - C:\DOCUME~1\ADMINI~1\Bureau\PROG_P~1\MOSTWA~1\SPYWAR~1\tools\iesdpb.dll
O10 - Unknown file in Winsock LSP: c:\windows\system32\nwprovau.dll
O23 - Service: BitDefender Arrakis Server (Arrakis3) - Unknown owner - C:\Program Files\Fichiers communs\BitDefender\BitDefender Arrakis Server\bin\Arrakis3.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
O23 - Service: ESET HTTP Server (EhttpSrv) - ESET - C:\Program Files\ESET\ESET NOD32 Antivirus\EHttpSrv.exe
O23 - Service: ESET Service (ekrn) - ESET - C:\Program Files\ESET\ESET NOD32 Antivirus\ekrn.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\1150\Intel 32\IDriverT.exe
O23 - Service: File Security Kernel Anti-Spyware Driver (ikhfile) - PCTools Research Pty Ltd. - C:\Documents and Settings\Administrateur\Bureau\prog_portable\Most Wanted Portable Applications\Spyware Doctor\ikhfile.sys
O23 - Service: Kernel Anti-Spyware Driver (ikhlayer) - PCTools Research Pty Ltd. - C:\Documents and Settings\Administrateur\Bureau\prog_portable\Most Wanted Portable Applications\Spyware Doctor\ikhlayer.sys
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Program Files\Java\jre6\bin\jqs.exe
O23 - Service: BitDefender Desktop Update Service (LIVESRV) - BitDefender SRL - C:\Program Files\Fichiers communs\BitDefender\BitDefender Update Service\livesrv.exe
O23 - Service: LogMeIn Maintenance Service (LMIMaint) - LogMeIn, Inc. - C:\Program Files\LogMeIn\x86\RaMaint.exe
O23 - Service: nProtect GameGuard Service (npggsvc) - Unknown owner - C:\WINDOWS\system32\GameMon.des.exe (file missing)
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - NetGroup - Politecnico di Torino - C:\Program Files\WinPcap\rpcapd.exe
O23 - Service: PC Tools Spyware Doctor (SDhelper) - Unknown owner - C:\Documents and Settings\Administrateur\Bureau\prog_portable\Most Wanted Portable Applications\Spyware Doctor\SDhelper.exe (file missing)
O23 - Service: BitDefender Virus Shield (VSSERV) - BitDefender S.R.L. - C:\Program Files\BitDefender\BitDefender 2008\vsserv.exe
O23 - Service: BitDefender Communicator (XCOMM) - BitDefender - C:\Program Files\Fichiers communs\BitDefender\BitDefender Communicator\xcommsvr.exe