Fenetre d'alerte

bonjour,
Hier je ne pouvais plus ouvrir mon ordinateur. Lorsque je le demarrais windows commencait a se lancer puis l ecran devenait noir et le restait.
Je pouvais juste l ouvrir en mode sans echec.
aujourd hui il s ouvre mais des fenetres service affichage de messsage apparaissent regulierement en me disant stop windows require immediate assistance... download regproscan.com ou autres logiciels suspicieux.
En antivirus j ai avast et je fais regulierement des regcleaner et spyboot.
J'ai fait hihackthis et voila ce que ca donne:
Logfile of HijackThis v1.99.1
Scan saved at 14:07:27, on 2007-01-14
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\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\Program Files\AVG Anti-Spyware 7.5\guard.exe
C:\WINDOWS\system32\drivers\KodakCCS.exe
C:\WINDOWS\System32\nvsvc32.exe
C:\WINDOWS\System32\HPZipm12.exe
C:\WINDOWS\System32\ScsiAccess.EXE
C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Java\j2re1.4.2_03\bin\jusched.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\WINDOWS\AGRSMMSG.exe
C:\Program Files\Lexmark X6100 Series\lxbfbmgr.exe
C:\WINDOWS\System32\explorer.exe
C:\WINDOWS\System32\nigho.exe
C:\WINDOWS\System32\winIogon.exe
C:\Program Files\Google\GoogleToolbarNotifier\1.2.908.8472\GoogleToolbarNotifier.exe
C:\Program Files\Windows Desktop Search\WindowsSearch.exe
C:\Program Files\Lexmark X6100 Series\lxbfbmon.exe
C:\Program Files\Windows Desktop Search\WindowsSearchIndexer.exe
C:\Program Files\SLD Codec Pack\mplayerc.exe
C:\WINDOWS\System32\LVComsX.exe
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\Program Files\Internet Explorer\IEXPLORE.EXE
C:\WINDOWS\System32\wuauclt.exe
C:\Documents and Settings\Propriétaire\Bureau\hijackthis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: dsWebAllowBHO Class - {2F85D76C-0569-466F-A488-493E6BD0E955} - C:\Program Files\Windows Desktop Search\dsWebAllow.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\System32\msdxm.ocx
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\j2re1.4.2_03\bin\jusched.exe
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\System32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [Lexmark X6100 Series] "C:\Program Files\Lexmark X6100 Series\lxbfbmgr.exe"
O4 - HKLM\..\Run: [Windows Explorer] C:\WINDOWS\System32\explorer.exe
O4 - HKLM\..\Run: [Services] C:\WINDOWS\System32\nigho.exe
O4 - HKLM\..\Run: [Windows Logon Application] C:\WINDOWS\System32\winIogon.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\1.2.908.8472\GoogleToolbarNotifier.exe
O4 - Startup: PowerReg Scheduler V3.exe
O4 - Global Startup: Windows Desktop Search.lnk = C:\Program Files\Windows Desktop Search\WindowsSearch.exe
O8 - Extra context menu item: &Search - http://bar.mywebsearch.com/menusearch.html?p=ZCxdm599YYCA
O8 - Extra context menu item: E&xport to Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\WINDOWS\System32\msjava.dll
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O16 - DPF: TruePass EPF 7,0,100,717 - https://blrscr3.egs-seg.gc.ca/applets/entrusttruepassapplet-epf.cab
O16 - DPF: TruePass EPF 7,0,100,730 - https://blrscr3.egs-seg.gc.ca/applets/entrusttruepassapplet-epf.cab
O16 - DPF: {4F1E5B1A-2A80-42CA-8532-2D05CB959537} (MSN Photo Upload Tool) - http://volatiana.spaces.live.com//PhotoUpload/MsnPUpld.cab
O16 - DPF: {511F9316-771B-4953-A268-1C36DA667FE9} - http://ip.sponsoradulto.com/cab/3/fr/SysWebTelecomInt.cab
O16 - DPF: {8C875948-9C60-4381-9248-0DF180542D53} - http://installs.spamblockerutility.com/installs/spamblockerutility/programs/spamblockerutility.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{1D7198F2-15A6-45E9-9CC7-02714214038B}: NameServer = 206.47.244.15 206.47.244.107
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSNMES~1\MSGRAP~1.DLL
O23 - Service: Adobe LM Service - Unknown owner - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Adpsrin - Unknown owner - (no file)
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: AVG Anti-Spyware Guard - Anti-Malware Development a.s. - C:\Program Files\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: Kodak Camera Connection Software (KodakCCS) - Eastman Kodak Company - C:\WINDOWS\system32\drivers\KodakCCS.exe
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: NVIDIA Driver Helper Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\System32\nvsvc32.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\System32\HPZipm12.exe
O23 - Service: ScsiAccess - Unknown owner - C:\WINDOWS\System32\ScsiAccess.EXE
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - C:\Program Files\Analog Devices\SoundMAX\SMAgent.exe

Merci de m aider