Probleme de vitesse du pc

bonjour a tous ,
g un petit probleme , surement du a un spy ou un tojan

mon pc est lent , office plante , les applications mettent du temps a démarrer .
je vient de reformatter et réinstaller windows xp pro . pouvez vous m'aider ?
Je commence a devenir fou !!!!!
voici mon log HijackThis ps : je mi sui repris a 5 fois pour k'il me sorte un log sans planter.

Logfile of HijackThis v1.99.1
Scan saved at 19:11:39, on 29/11/2005
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\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Media Gateway\MediaGateway.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\MsLX32.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\system32\pnpsp2fix.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\System32\MsJ32.exe
C:\WINDOWS\system32\cmd.exe
C:\WINDOWS\System32\wiaacmgr.exe
C:\install-5.exe
C:\WINDOWS\System32\taskmgr.exe
C:\WINDOWS\System32\taskmgr.exe
C:\install-5.exe
c:\fw32.exe
C:\PROGRA~1\MICROS~2\OFFICE11\OUTLOOK.EXE
c:\fw32.exe
c:\fw32.exe
C:\PROGRA~1\MOZILL~1\FIREFOX.EXE
C:\WINDOWS\System32\FWMs32.exe
C:\Documents and Settings\jean-luc\Bureau\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://g.msn.fr/0SEFRFR/SAOS02
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://runonce.msn.com/?v=msgrv75
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.google.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: SABHO - {21B4ACC4-8874-4AEC-AEAC-F567A249B4D4} - c:\program files\zango\zangohook.dll (file missing)
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: Barre d'outils MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar\01.01.2607.0\fr\msntb.dll
O3 - Toolbar: Zango Toolbar - {EA0D26BD-9029-431A-86E0-83152D67828A} - C:\Program Files\Zango Programs\Zango Toolbar\ZangoTB.dll
O4 - HKLM\..\Run: [HPDJ Taskbar Utility] C:\WINDOWS\System32\spool\drivers\w32x86\3\hpztsb05.exe
O4 - HKLM\..\Run: [NeroCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Media Gateway] C:\Program Files\Media Gateway\MediaGateway.exe
O4 - HKLM\..\Run: [navautoprotect] C:\WINDOWS\System32\MsJ32.exe
O4 - HKLM\..\Run: [msfirewall32] C:\WINDOWS\System32\FWMs32.exe
O4 - HKLM\..\RunServices: [microsft windows updates] mswupdate32.exe
O4 - HKLM\..\RunServices: [IEOptimizer] Kizlo.exe
O4 - HKLM\..\RunServices: [MS Unix Binary] hypertrm.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - HKCU\..\RunServices: [IEOptimizer] Kizlo.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
O14 - IERESET.INF: START_PAGE_URL=http://www.google.fr/
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: MsLX32 - Unknown owner - C:\WINDOWS\MsLX32.exe
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Plug-n-Play SP2 Fix (sp2pnpfix) - Unknown owner - C:\WINDOWS\system32\pnpsp2fix.exe