Spyware, fond d'écran bloqué

Bonjour,

J'ai depuis quelques jours mon fond d'écran bloqué par une pub "Warning! spyware threat has been detected on your PC...", Avast m'avertis de la présence d'un cheval de troie qui reviens tout le temps même aprés l'avoir supprimé. Aprés de nombreuses consultations sur les divers forums consacrés à mon problème, de nombreux scans, de téléchargements d'antispywares, d'outils de nettoyage... : CCleaner, Spybot, Ad-Aware, multi-virus Cleaner, Smitfraudis, AVG, hijackthis... je ne parviens pas à trouver la solution au problème.
Je colle ici mon dernier rapport Hijackthis en espérant que quelqu'un pourra me venir en aide...merci d'avance.

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 13:28:42, on 29/10/2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16544)
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\svchost.exe
C:\Program Files\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\WINDOWS\system32\qiawpbjj.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\ehome\ehtray.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Sonic\DigitalMedia Plus\DigitalMedia Archive\DMAScheduler.exe
C:\Program Files\HP\HP Software Update\HPWuSchd2.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
C:\Program Files\Microsoft LifeChat\LifeChat.exe
C:\PROGRA~1\NUMERI~1\MONASS~1\SMARTB~1\MotiveSB.exe
C:\WINDOWS\system32\oodtray.exe
C:\Program Files\PowerISO\PWRISOVM.EXE
C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
C:\Program Files\Microsoft Office\Office12\GrooveMonitor.exe
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Adobe\Acrobat 8.0\Acrobat\Acrotray.exe
C:\Program Files\SAMSUNG\FW LiveUpdate\Liveupdate.exe
C:\Program Files\Hercules\Hercules Blog Webcam\CamService.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
C:\WINDOWS\arservice.exe
C:\Program Files\POP Peeper\POPPeeper.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\PROGRA~1\MSNMES~1\DEVICE~1\msgrdvmn.exe
C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\WINDOWS\eHome\ehRecvr.exe
C:\WINDOWS\eHome\ehSched.exe
C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\oodag.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
C:\WINDOWS\system32\HPZipm12.exe
C:\WINDOWS\system32\dllhost.exe
C:\WINDOWS\eHome\ehmsas.exe
C:\WINDOWS\system32\msiexec.exe
C:\WINDOWS\system32\wuauclt.exe
C:\HP\KBD\KBD.EXE
c:\windows\system\hpsysdrv.exe
C:\Program Files\Fichiers communs\InstallShield\UpdateService\issch.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
C:\DOCUME~1\HP_ADM~1\LOCALS~1\Temp\Répertoire temporaire 2 pour HiJackThis[1].zip\HijackThis.exe

F2 - REG:system.ini: UserInit=C:\WINDOWS\system32\qiawpbjj.exe,C:\WINDOWS\system32\userinit.exe
O2 - BHO: (no name) - {00000000-d9e3-4bc6-a0bd-3d0ca4be5271} - (no file)
O2 - BHO: (no name) - {00000012-890e-4aac-afd9-eff6954a34dd} - (no file)
O2 - BHO: (no name) - {026B5895-3E8E-49A9-8EEE-B52A326DA962} - (no file)
O2 - BHO: (no name) - {029e02f0-a0e5-4b19-b958-7bf2db29fb13} - (no file)
O2 - BHO: Aide pour le lien d'Adobe PDF Reader - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {06dfedaa-6196-11d5-bfc8-00508b4a487d} - (no file)
O2 - BHO: (no name) - {12F02779-6D88-4958-8AD3-83C12D86ADC7} - (no file)
O2 - BHO: (no name) - {1adbcce8-cf84-441e-9b38-afc7a19c06a4} - (no file)
O2 - BHO: (no name) - {2d7cb618-cc1c-4126-a7e3-f5b12d3bcf71} - (no file)
O2 - BHO: (no name) - {51641ef3-8a7a-4d84-8659-b0911e947cc8} - (no file)
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\Program Files\Spybot - Search & Destroy\SDHelper.dll
O2 - BHO: (no name) - {53C330D6-A4AB-419B-B45D-FD4411C1FEF4} - (no file)
O2 - BHO: (no name) - {54645654-2225-4455-44A1-9F4543D34546} - (no file)
O2 - BHO: (no name) - {669695bc-a811-4a9d-8cdf-ba8c795f261e} - (no file)
O2 - BHO: (no name) - {6abc861a-31e7-4d91-b43b-d3c98f22a5c0} - (no file)
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - C:\PROGRA~1\MICROS~3\Office12\GRA8E1~1.DLL
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - C:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: (no name) - {944864a5-3916-46e2-96a9-a2e84f3f1208} - (no file)
O2 - BHO: (no name) - {a4a435cf-3583-11d4-91bd-0048546a1450} - (no file)
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Adobe PDF Conversion Toolbar Helper - {AE7CD045-E861-484f-8273-0445EE161910} - C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O2 - BHO: Google Toolbar Notifier BHO - {AF69DE43-7D58-4638-B6FA-CE66B5AD205D} - C:\Program Files\Google\GoogleToolbarNotifier\2.1.615.5858\swg.dll
O2 - BHO: (no name) - {b8875bfe-b021-11d4-bfa8-00508b8e9bd3} - (no file)
O2 - BHO: (no name) - {bb936323-19fa-4521-ba29-eca6a121bc78} - (no file)
O2 - BHO: (no name) - {c2680e10-1655-4a0e-87f8-4259325a84b7} - (no file)
O2 - BHO: (no name) - {c4ca6559-2cf1-48b6-96b2-8340a06fd129} - (no file)
O2 - BHO: (no name) - {c5af2622-8c75-4dfb-9693-23ab7686a456} - (no file)
O2 - BHO: (no name) - {ca1d1b05-9c66-11d5-a009-000103c1e50b} - (no file)
O2 - BHO: (no name) - {d8efadf1-9009-11d6-8c73-608c5dc19089} - (no file)
O2 - BHO: (no name) - {e9147a0a-a866-4214-b47c-da821891240f} - (no file)
O2 - BHO: (no name) - {e9306072-417e-43e3-81d5-369490beef7c} - (no file)
O3 - Toolbar: Yahoo! Toolbar avec bloqueur de fenêtres pop-up - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll (file missing)
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: Adobe PDF - {47833539-D0C5-4125-9FA8-0819E2EAAC93} - C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll
O4 - HKLM\..\Run: [ehTray] C:\WINDOWS\ehome\ehtray.exe
O4 - HKLM\..\Run: [ftutil2] rundll32.exe ftutil2.dll,SetWriteCacheMode
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet /keeploaded /nodetect
O4 - HKLM\..\Run: [HPHUPD08] c:\Program Files\HP\Digital Imaging\{33D6CC28-9F75-4d1b-A11D-98895B3A3729}\hphupd08.exe
O4 - HKLM\..\Run: [DMAScheduler] c:\Program Files\Sonic\DigitalMedia Plus\DigitalMedia Archive\DMAScheduler.exe
O4 - HKLM\..\Run: [Recguard] C:\WINDOWS\SMINST\RECGUARD.EXE
O4 - HKLM\..\Run: [HPBootOp] "C:\Program Files\Hewlett-Packard\HP Boot Optimizer\HPBootOp.exe" /run
O4 - HKLM\..\Run: [Reminder] "C:\Windows\Creator\Remind_XP.exe"
O4 - HKLM\..\Run: [HP Software Update] "C:\Program Files\HP\HP Software Update\HPWuSchd2.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKLM\..\Run: [ISUSPM Startup] "C:\Program Files\Fichiers communs\InstallShield\UpdateService\isuspm.exe" -startup
O4 - HKLM\..\Run: [LifeChat] "C:\Program Files\Microsoft LifeChat\LifeChat.exe"
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Motive SmartBridge] C:\PROGRA~1\NUMERI~1\MONASS~1\SMARTB~1\MotiveSB.exe
O4 - HKLM\..\Run: [OODefragTray] C:\WINDOWS\system32\oodtray.exe
O4 - HKLM\..\Run: [PWRISOVM.EXE] C:\Program Files\PowerISO\PWRISOVM.EXE
O4 - HKLM\..\Run: [GrooveMonitor] "C:\Program Files\Microsoft Office\Office12\GrooveMonitor.exe"
O4 - HKLM\..\Run: [Acrobat Assistant 8.0] "C:\Program Files\Adobe\Acrobat 8.0\Acrobat\Acrotray.exe"
O4 - HKLM\..\Run: [Adobe_ID0EYTHM] C:\PROGRA~1\FICHIE~1\Adobe\ADOBEV~1\Server\bin\VERSIO~2.EXE
O4 - HKLM\..\Run: [Name of App] C:\Program Files\SAMSUNG\FW LiveUpdate\Liveupdate.exe
O4 - HKLM\..\Run: [HerculesCamService] C:\Program Files\Hercules\Hercules Blog Webcam\CamService.exe
O4 - HKLM\..\Run: [!AVG Anti-Spyware] "C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\avgas.exe" /minimized
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [swg] C:\Program Files\Google\GoogleToolbarNotifier\GoogleToolbarNotifier.exe
O4 - HKCU\..\Run: [POP Peeper] "C:\Program Files\POP Peeper\POPPeeper.exe" -min
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [WindowsLivePhone] "C:\PROGRA~1\MSNMES~1\DEVICE~1\msgrdvmn.exe" /AutoRun
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - .DEFAULT User Startup: Pin.lnk = C:\hp\bin\CLOAKER.EXE (User 'Default user')
O4 - Global Startup: HP Digital Imaging Monitor.lnk = C:\Program Files\HP\Digital Imaging\bin\hpqtra08.exe
O8 - Extra context menu item: Ajouter au fichier PDF existant - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convertir en Adobe PDF - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convertir la cible du lien en Adobe PDF - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convertir la cible du lien en un fichier PDF existant - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convertir la sélection en Adobe PDF - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECapture.html
O8 - Extra context menu item: Convertir la sélection en un fichier PDF existant - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppend.html
O8 - Extra context menu item: Convertir les liens sélectionnés en fichier Adobe PDF - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIECaptureSelLinks.html
O8 - Extra context menu item: Convertir les liens sélectionnés en un fichier PDF existant - res://C:\Program Files\Adobe\Acrobat 8.0\Acrobat\AcroIEFavClient.dll/AcroIEAppendSelLinks.html
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - C:\PROGRA~1\MICROS~3\Office12\ONBttnIE.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~3\Office12\REFIEBAR.DLL
O9 - Extra button: Aide à la connexion - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra 'Tools' menuitem: Aide à la connexion - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O17 - HKLM\System\CCS\Services\Tcpip\..\{1CEDAE29-FA41-4AE6-BD3D-D3CBBA6A701C}: NameServer = 208.67.220.220,208.67.222.222
O17 - HKLM\System\CS1\Services\Tcpip\..\{1CEDAE29-FA41-4AE6-BD3D-D3CBBA6A701C}: NameServer = 208.67.220.220,208.67.222.222
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - C:\PROGRA~1\MICROS~3\Office12\GR99D3~1.DLL
O23 - Service: Ad-Aware 2007 Service (aawservice) - Lavasoft AB - C:\Program Files\Lavasoft\Ad-Aware 2007\aawservice.exe
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Adobe Version Cue CS3 {fr_FR} (Adobe Version Cue CS3) - Adobe Systems Incorporated - C:\Program Files\Fichiers communs\Adobe\Adobe Version Cue CS3\Server\bin\VersionCueCS3.exe
O23 - Service: AdobeVersionCue - Adobe Sytems - C:\Program Files\Adobe\Adobe Version Cue\service\VersionCue.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: AVG Anti-Spyware Guard - GRISOFT s.r.o. - C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\guard.exe
O23 - Service: ##Id_String1.6844F930_1628_4223_B5CC_5BB94B879762## (Bonjour Service) - Apple Computer, Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: FLEXnet Licensing Service - Macrovision Europe Ltd. - C:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Google Updater Service (gusvc) - Google - C:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\1050\Intel 32\IDriverT.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Fichiers communs\LightScribe\LSSrvc.exe
O23 - Service: NBService - Nero AG - C:\Program Files\Nero\Nero 7\Nero BackItUp\NBService.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Fichiers communs\Ahead\Lib\NMIndexingService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: O&O Defrag - O&O Software GmbH - C:\WINDOWS\system32\oodag.exe
O23 - Service: Windows Live Setup Service (WLSetupSvc) - Unknown owner - C:\Program Files\Windows Live\installer\WLSetupSvc.exe