Problème avec Firefox

Bonjour,
J'ai un souci depuis plusieurs mois, des fenêtres de pubs apparaissent sur Firefox (version 8.0.1) et après des heures de lectures des différents forums sur le sujet, je n'arrive toujours pas à m'en débarrasser.
ci-dessous un post du log de HijackThis
Merci d'avance pour votre aidre


Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 22:02:13, on 12/01/2012
Platform: Unknown Windows (WinNT 6.01.3505 SP1)
MSIE: Internet Explorer v8.00 (8.00.7601.17514)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\DigitalPersona\Bin\DPAgent.exe
C:\Program Files (x86)\Common Files\LightScribe\LightScribeControlPanel.exe
C:\Program Files (x86)\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files (x86)\DAEMON Tools Lite\DTLite.exe
C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPMSGSVC.exe
C:\Users\Laurent\AppData\Roaming\Dropbox\bin\Dropbox.exe
C:\Program Files (x86)\Hewlett-Packard\HP Print View Software\HP Print View Resource Center\HPPrintViewResourceCenter.exe
C:\Program Files\AVAST Software\Avast\AvastUI.exe
C:\Program Files (x86)\Hewlett-Packard\Clavier sans fil Elite de HP\HPKEYBOARDg.EXE
C:\Program Files\Motorola\Bluetooth\btplayerctrl.exe
C:\Program Files (x86)\Agence-Exclusive\pctuto.exe
C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe
C:\Program Files (x86)\HP\HP Software Update\hpwuschd2.exe
C:\Program Files (x86)\iTunes\iTunesHelper.exe
C:\Users\Laurent\AppData\Local\comnetwork\comnetwork.exe
C:\Program Files (x86)\Hewlett-Packard\Media\Webcam\YCMMirage.exe
C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe
D:\Programmes\Mozilla Firefox\firefox.exe
D:\Programmes\Mozilla Firefox\plugin-container.exe
C:\Users\Laurent\Downloads\HiJackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://g.uk.msn.com/HPNOT/3
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/ig
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://g.uk.msn.com/HPNOT/3
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://g.uk.msn.com/HPNOT/3
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\Windows\SysWOW64\blank.htm
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = 127.0.0.1;*.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
F2 - REG:system.ini: UserInit=userinit.exe
O2 - BHO: AcroIEHelperStub - {18DF081C-E8AD-4283-A596-FA578C2EBDC3} - C:\Program Files (x86)\Common Files\Adobe\Acrobat\ActiveX\AcroIEHelperShim.dll
O2 - BHO: PCTBHO - {293A63F7-C3B6-423a-9845-901AC0A7EE6E} - C:\Program Files (x86)\Agence-Exclusive\pctutoBHO.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files (x86)\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O2 - BHO: Programme d'aide de l'Assistant de connexion Windows Live ID - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files (x86)\Java\jre6\bin\jp2ssv.dll
O3 - Toolbar: avast! WebRep - {8E5E2654-AD2D-48bf-AC2D-D17F00898D06} - C:\Program Files\AVAST Software\Avast\aswWebRepIE.dll
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe" MSRun
O4 - HKLM\..\Run: [HP Quick Launch] C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPMSGSVC.exe
O4 - HKLM\..\Run: [Easybits Recovery] C:\Program Files (x86)\EasyBits For Kids\ezRecover.exe
O4 - HKLM\..\Run: [avast] "C:\Program Files\AVAST Software\Avast\avastUI.exe" /nogui
O4 - HKLM\..\Run: [HP KEYBOARDg] "C:\Program Files (x86)\Hewlett-Packard\Clavier sans fil Elite de HP\HPKEYBOARDg.EXE"
O4 - HKLM\..\Run: [pctuto] "C:\Program Files (x86)\Agence-Exclusive\pctuto.exe"
O4 - HKLM\..\Run: [AppleSyncNotifier] C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\AppleSyncNotifier.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files (x86)\Common Files\Java\Java Update\jusched.exe"
O4 - HKLM\..\Run: [APSDaemon] "C:\Program Files (x86)\Common Files\Apple\Apple Application Support\APSDaemon.exe"
O4 - HKLM\..\Run: [Adobe ARM] "C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\AdobeARM.exe"
O4 - HKLM\..\Run: [HP Software Update] C:\Program Files (x86)\Hp\HP Software Update\HPWuSchd2.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files (x86)\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "C:\Program Files (x86)\iTunes\iTunesHelper.exe"
O4 - HKLM\..\Run: [comnetwork] "C:\Users\Laurent\AppData\Local\comnetwork\comnetwork.exe"
O4 - HKLM\..\RunOnce: [autoupdater] C:\Users\Laurent\AppData\Roaming\Agence-Exclusive\Agence-Exclusive\autoupdater.exe -runonce
O4 - HKCU\..\Run: [HPAdvisorDock] C:\Program Files (x86)\Hewlett-Packard\HP Advisor\Dock\HPAdvisorDock.exe
O4 - HKCU\..\Run: [LightScribe Control Panel] C:\Program Files (x86)\Common Files\LightScribe\LightScribeControlPanel.exe -hidden
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files (x86)\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKCU\..\Run: [DAEMON Tools Lite] "C:\Program Files (x86)\DAEMON Tools Lite\DTLite.exe" -autorun
O4 - Startup: Dropbox.lnk = Laurent\AppData\Roaming\Dropbox\bin\Dropbox.exe
O4 - Startup: HP Print View Resource Center.lnk = C:\Program Files (x86)\Hewlett-Packard\HP Print View Software\HP Print View Resource Center\HPPrintViewResourceCenter.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~2\MICROS~3\Office12\EXCEL.EXE/3000
O9 - Extra button: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1004 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra 'Tools' menuitem: @C:\Program Files (x86)\Windows Live\Writer\WindowsLiveWriterShortcuts.dll,-1003 - {219C3416-8CB2-491a-A3C7-D9FCDDC9D600} - C:\Program Files (x86)\Windows Live\Writer\WriterBrowserExtension.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~2\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: @C:\Program Files\Motorola\Bluetooth\btmshell.dll,-137 - {bd707fe6-39f6-4bda-9265-86a76719bdc5} - C:\Program Files\Motorola\Bluetooth\btmiesend.htm
O9 - Extra 'Tools' menuitem: @C:\Program Files\Motorola\Bluetooth\btmshell.dll,-137 - {bd707fe6-39f6-4bda-9265-86a76719bdc5} - C:\Program Files\Motorola\Bluetooth\btmiesend.htm
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files (x86)\Spybot - Search & Destroy\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search && Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\Program Files (x86)\Spybot - Search & Destroy\SDHelper.dll
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O10 - Unknown file in Winsock LSP: c:\program files (x86)\common files\microsoft shared\windows live\wlidnsp.dll
O13 - Gopher Prefix:
O16 - DPF: {D27CDB6E-AE6D-11CF-96B8-444553540000} (Shockwave Flash Object) - http://fpdownload2.macromedia.com/get/shockwave/cabs/flash/swflash.cab
O18 - Protocol: wlpg - {E43EF6CD-A37A-4A9B-9E6F-83F89B8E6324} - C:\Program Files (x86)\Windows Live\Photo Gallery\AlbumDownloadProtocolHandler.dll
O23 - Service: Adobe Acrobat Update Service (AdobeARMservice) - Adobe Systems Incorporated - C:\Program Files (x86)\Common Files\Adobe\ARM\1.0\armsvc.exe
O23 - Service: Andrea ST Filters Service (AESTFilters) - Andrea Electronics Corporation - C:\Program Files\IDT\WDM\AESTSr64.exe
O23 - Service: @%SystemRoot%\system32\Alg.exe,-112 (ALG) - Unknown owner - C:\Windows\System32\alg.exe (file missing)
O23 - Service: AMD External Events Utility - Unknown owner - C:\Windows\system32\atiesrxx.exe (file missing)
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\AppleMobileDeviceService.exe
O23 - Service: avast! Antivirus - AVAST Software - C:\Program Files\AVAST Software\Avast\AvastSvc.exe
O23 - Service: Bluetooth Device Manager - Motorola, Inc. - C:\Program Files\Motorola\Bluetooth\devmgrsrv.exe
O23 - Service: Bluetooth Media Service - Motorola, Inc. - C:\Program Files\Motorola\Bluetooth\audiosrv.exe
O23 - Service: Bluetooth OBEX Service - Motorola, Inc. - C:\Program Files\Motorola\Bluetooth\obexsrv.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: @C:\Program Files\DigitalPersona\Bin\DpHostW.exe,-128 (DpHost) - DigitalPersona, Inc. - C:\Program Files\DigitalPersona\Bin\DpHostW.exe
O23 - Service: @%SystemRoot%\system32\efssvc.dll,-100 (EFS) - Unknown owner - C:\Windows\System32\lsass.exe (file missing)
O23 - Service: Easybits Services for Windows (ezSharedSvc) - EasyBits Software AS - C:\Windows\System32\ezSharedSvcHost.exe
O23 - Service: @%systemroot%\system32\fxsresm.dll,-118 (Fax) - Unknown owner - C:\Windows\system32\fxssvc.exe (file missing)
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files (x86)\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: FLEXnet Licensing Service 64 - Macrovision Europe Ltd. - C:\Program Files\Common Files\Macrovision Shared\FLEXnet Publisher\FNPLicensingService64.exe
O23 - Service: GameConsoleService - WildTangent, Inc. - C:\Program Files (x86)\HP Games\HP Game Console\GameConsoleService.exe
O23 - Service: Service Google Update (gupdate) (gupdate) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: Service Google Update (gupdatem) (gupdatem) - Google Inc. - C:\Program Files (x86)\Google\Update\GoogleUpdate.exe
O23 - Service: HP Health Check Service - Hewlett-Packard Company - C:\Program Files (x86)\Hewlett-Packard\HP Health Check\hphc_service.exe
O23 - Service: HP Wireless Assistant Service - Hewlett-Packard Company - C:\Program Files\Hewlett-Packard\HP Wireless Assistant\HPWA_Service.exe
O23 - Service: HP Quick Synchronization Service (HPDrvMntSvc.exe) - Hewlett-Packard Company - C:\Program Files (x86)\Hewlett-Packard\Shared\HPDrvMntSvc.exe
O23 - Service: HP Software Framework Service (hpqwmiex) - Hewlett-Packard Company - C:\Program Files (x86)\Hewlett-Packard\Shared\hpqwmiex.exe
O23 - Service: HP Service (hpsrv) - Unknown owner - C:\Windows\system32\Hpservice.exe (file missing)
O23 - Service: HPWMISVC - Unknown owner - C:\Program Files (x86)\Hewlett-Packard\HP Quick Launch\HPWMISVC.exe
O23 - Service: Service de l'iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: @keyiso.dll,-100 (KeyIso) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files (x86)\Common Files\LightScribe\LSSrvc.exe
O23 - Service: Intel(R) Management and Security Application Local Management Service (LMS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\LMS\LMS.exe
O23 - Service: MAJTuto - Unknown owner - C:\Users\Laurent\AppData\Local\MAJTuto\MAJTuto.exe
O23 - Service: @comres.dll,-2797 (MSDTC) - Unknown owner - C:\Windows\System32\msdtc.exe (file missing)
O23 - Service: @%SystemRoot%\System32\netlogon.dll,-102 (Netlogon) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\psbase.dll,-300 (ProtectedStorage) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: @%systemroot%\system32\Locator.exe,-2 (RpcLocator) - Unknown owner - C:\Windows\system32\locator.exe (file missing)
O23 - Service: @%SystemRoot%\system32\samsrv.dll,-1 (SamSs) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: SBSD Security Center Service (SBSDWSCService) - Safer Networking Ltd. - C:\Program Files (x86)\Spybot - Search & Destroy\SDWinSec.exe
O23 - Service: @%SystemRoot%\system32\snmptrap.exe,-3 (SNMPTRAP) - Unknown owner - C:\Windows\System32\snmptrap.exe (file missing)
O23 - Service: @%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)
O23 - Service: @%SystemRoot%\system32\sppsvc.exe,-101 (sppsvc) - Unknown owner - C:\Windows\system32\sppsvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\stlang64.dll,-10101 (STacSV) - IDT, Inc. - C:\Program Files\IDT\WDM\STacSV64.exe
O23 - Service: @%SystemRoot%\system32\ui0detect.exe,-101 (UI0Detect) - Unknown owner - C:\Windows\system32\UI0Detect.exe (file missing)
O23 - Service: Intel(R) Management & Security Application User Notification Service (UNS) - Intel Corporation - C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\UNS\UNS.exe
O23 - Service: @%SystemRoot%\system32\vaultsvc.dll,-1003 (VaultSvc) - Unknown owner - C:\Windows\system32\lsass.exe (file missing)
O23 - Service: Validity VCS Fingerprint Service (vcsFPService) - Validity Sensors, Inc. - C:\Windows\system32\vcsFPService.exe
O23 - Service: @%SystemRoot%\system32\vds.exe,-100 (vds) - Unknown owner - C:\Windows\System32\vds.exe (file missing)
O23 - Service: @%systemroot%\system32\vssvc.exe,-102 (VSS) - Unknown owner - C:\Windows\system32\vssvc.exe (file missing)
O23 - Service: @%SystemRoot%\system32\Wat\WatUX.exe,-601 (WatAdminSvc) - Unknown owner - C:\Windows\system32\Wat\WatAdminSvc.exe (file missing)
O23 - Service: @%systemroot%\system32\wbengine.exe,-104 (wbengine) - Unknown owner - C:\Windows\system32\wbengine.exe (file missing)
O23 - Service: @%Systemroot%\system32\wbem\wmiapsrv.exe,-110 (wmiApSrv) - Unknown owner - C:\Windows\system32\wbem\WmiApSrv.exe (file missing)
O23 - Service: @%PROGRAMFILES%\Windows Media Player\wmpnetwk.exe,-101 (WMPNetworkSvc) - Unknown owner - C:\Program Files (x86)\Windows Media Player\wmpnetwk.exe (file missing)