Ordi infecté

Bonjour, Depuis quelque jours mon ordi est lent et des page de pub se mette toute seul sur firefox... Des onglet s'ouvre tout seul pour afficher une pub! c'est très chiant!!!

Voici le rapport Hijack:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 09:43:54, on 03/03/2010
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v8.00 (8.00.6001.18702)
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\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Windows Sidebar\sidebar.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\ESET\ESET Smart Security\egui.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Fichiers communs\Nokia\MPlatform\NokiaMServer.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
C:\Program Files\Nokia\Nokia Ovi Suite\NokiaOviSuite.exe
C:\Program Files\Windows Sidebar\sidebar.exe
D:\Programme files\Widgets\YahooWidgets.exe
D:\Programme files\Widgets\YahooWidgets.exe
D:\Programme files\Widgets\YahooWidgets.exe
D:\Programme files\Widgets\YahooWidgets.exe
C:\Program Files\ESET\ESET Smart Security\ekrn.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Fichiers communs\Nokia\NoA\nokiaaserver.exe
C:\Program Files\PC Connectivity Solution\ServiceLayer.exe
C:\Program Files\Windows Live\Contacts\wlcomm.exe
C:\Program Files\PC Connectivity Solution\Transports\NclUSBSrv.exe
C:\Program Files\PC Connectivity Solution\Transports\NclRSSrv.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\explorer.exe
C:\Program Files\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.google.fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.yahoo.com
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Windows XP Ultimate Edition By Mad Dog
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Favoris
O2 - BHO: AskBar BHO - {201f27d4-3704-41d6-89c1-aa35e39143ed} - C:\Program Files\AskBarDis\bar\bin\askBar.dll
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
O2 - BHO: flvdirect - {b5e99bfa-6b0a-b69a-49aa-b219e85a35d9} - (no file)
O3 - Toolbar: Ask Toolbar - {3041d03e-fd4b-44e0-b742-2d9b88305f98} - C:\Program Files\AskBarDis\bar\bin\askBar.dll
O4 - HKLM\..\Run: [Sidebar] C:\Program Files\Windows Sidebar\sidebar.exe /autoRun
O4 - HKLM\..\Run: [Vistadrv] C:\WINDOWS\system32\vsdrv\vsdrv.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [egui] "C:\Program Files\ESET\ESET Smart Security\egui.exe" /hide /waitservice
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [NokiaMServer] C:\Program Files\Fichiers communs\Nokia\MPlatform\NokiaMServer /watchfiles startup
O4 - HKLM\..\Run: [AdobeCS4ServiceManager] "C:\Program Files\Fichiers communs\Adobe\CS4ServiceManager\CS4ServiceManager.exe" -launchedbylogin
O4 - HKLM\..\RunOnce: [WIAWizardMenu] RUNDLL32.EXE C:\WINDOWS\system32\sti_ci.dll,WiaCreateWizardMenu
O4 - HKCU\..\Run: [ccleaner] "C:\Program Files\CCleaner\CCleaner.exe" /AUTO
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [NokiaOviSuite2] C:\Program Files\Nokia\Nokia Ovi Suite\NokiaOviSuite.exe -tray
O4 - HKUS\S-1-5-20\..\Run: [ccleaner] "C:\Program Files\CCleaner\CCleaner.exe" /AUTO (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-20\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-20\..\RunOnce: [MPlayer2_FixUp] C:\WINDOWS\inf\unregmp2.exe /Fixups (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [ccleaner] "C:\Program Files\CCleaner\CCleaner.exe" /AUTO (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [ccleaner] "C:\Program Files\CCleaner\CCleaner.exe" /AUTO (User 'Default user')
O4 - HKUS\.DEFAULT\..\RunOnce: [_nltide_3] rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N (User 'Default user')
O4 - Startup: Yahoo! Widgets.lnk = D:\Programme files\Widgets\YahooWidgets.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://D:\PROGRA~2\MICROS~1\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - D:\PROGRA~2\MICROS~1\OFFICE11\REFIEBAR.DLL
O16 - DPF: {30528230-99f7-4bb4-88d8-fa1d4f56a2ab} (Installation Support) - C:\Program Files\Yahoo!\Common\Yinsthelper.dll
O23 - Service: Eset HTTP Server (EhttpSrv) - ESET - C:\Program Files\ESET\ESET Smart Security\EHttpSrv.exe
O23 - Service: Eset Service (ekrn) - ESET - C:\Program Files\ESET\ESET Smart Security\ekrn.exe
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: GhostStartService - Symantec Corporation - C:\Program Files\Symantec\Norton Ghost 2003\GhostStartService.exe
O23 - Service: NVIDIA Display Driver Service (nvsvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: ServiceLayer - Nokia - C:\Program Files\PC Connectivity Solution\ServiceLayer.exe