Depuis quelques jours, lors du démarrage de Windows, j'ai systématiquement ces 2 fenêtres superposées qui s'ouvrent:
Le problème semblent être une infection virale (merci Google) mais qui n'est détecté ni par AVAST, ni par ANTIVIR 
Du coup, j'ai été incapable de la localiser pour le virer.
Un coup de main serait le bienvenu .....
Le rapport HiJackThis:
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 09:56:12, on 26/05/2009
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP3 (6.00.2900.5512)
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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\Ati2evxx.exe
E:\Antivirus & Firewall\Avast\Installation\aswUpdSv.exe
E:\Antivirus & Firewall\Avast\Installation\ashServ.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\sched.exe
E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\avguard.exe
C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
C:\Program Files\Bonjour\mDNSResponder.exe
C:\Program Files\Java\jre6\bin\jqs.exe
C:\WINDOWS\system32\svchost.exe
E:\Antivirus & Firewall\Avast\Installation\ashMaiSv.exe
E:\Antivirus & Firewall\Avast\Installation\ashWebSv.exe
C:\WINDOWS\system32\wbem\wmiapsrv.exe
C:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
C:\WINDOWS\RTHDCPL.EXE
E:\ANTIVI~1\Avast\INSTAL~1\ashDisp.exe
E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\avgnt.exe
C:\WINDOWS\system32\LVCOMSX.EXE
E:\Périphériques\Webcam\LogiTray.exe
C:\Program Files\Java\jre6\bin\jusched.exe
E:\iTunes\Installation\iTunesHelper.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Windows Live\Messenger\msnmsgr.exe
E:\Lecteurs Virtuels\Daemon Tools\Installation\daemon.exe
C:\Program Files\iPod\bin\iPodService.exe
E:\Périphériques\Webcam\FxSvr2.exe
E:\FIREFOX\Installation\firefox.exe
C:\Program Files\Java\jre6\bin\jucheck.exe
E:\Nettoyage PC\HiJackThis\HiJackThis.exe
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://search.msn.fr/spbasic.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.msn.fr/
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = *.local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F3 - REG:win.ini: load=C:\DOCUME~1\MATT&B~1\LOCALS~1\APPLIC~1\ieudinit.exe
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - E:\ADOBE Acrobat Reader\Installation\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
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: PDFCreator Toolbar Helper - {C451C08A-EC37-45DF-AAAD-18B51AB5E837} - C:\Program Files\PDFCreator Toolbar\v3.3.0.1\PDFCreator_Toolbar.dll
O2 - BHO: Java(tm) Plug-In 2 SSV Helper - {DBC80044-A445-435b-BC74-9C25C1C588A9} - C:\Program Files\Java\jre6\bin\jp2ssv.dll
O2 - BHO: JQSIEStartDetectorImpl - {E7E6F031-17CE-4C07-BC86-EABFE594F69C} - C:\Program Files\Java\jre6\lib\deploy\jqs\ie\jqs_plugin.dll
O3 - Toolbar: PDFCreator Toolbar - {31CF9EBE-5755-4A1D-AC25-2834D952D9B4} - C:\Program Files\PDFCreator Toolbar\v3.3.0.1\PDFCreator_Toolbar.dll
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [avast!] E:\ANTIVI~1\Avast\INSTAL~1\ashDisp.exe
O4 - HKLM\..\Run: [avgnt] "E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\avgnt.exe" /min
O4 - HKLM\..\Run: [LVCOMSX] C:\WINDOWS\system32\LVCOMSX.EXE
O4 - HKLM\..\Run: [LogitechVideoRepair] E:\Périphériques\Webcam\ISStart.exe
O4 - HKLM\..\Run: [LogitechVideoTray] E:\Périphériques\Webcam\LogiTray.exe
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre6\bin\jusched.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\QTTask.exe" -atboottime
O4 - HKLM\..\Run: [iTunesHelper] "E:\iTunes\Installation\iTunesHelper.exe"
O4 - HKLM\..\Run: [AdobeCS4ServiceManager] "C:\Program Files\Fichiers communs\Adobe\CS4ServiceManager\CS4ServiceManager.exe" -launchedbylogin
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\Windows Live\Messenger\msnmsgr.exe" /background
O4 - HKCU\..\Run: [DAEMON Tools Lite] "E:\Lecteurs Virtuels\Daemon Tools\Installation\daemon.exe" -autorun
O4 - HKLM\..\Policies\Explorer\Run: [MstInit] C:\DOCUME~1\MATT&B~1\APPLIC~1\mstinit.exe /waitservice
O4 - HKLM\..\Policies\Explorer\Run: [MqtgSVC] C:\DOCUME~1\MATT&B~1\LOCALS~1\Temp\mqtgsvc.exe /waitservice
O4 - HKCU\..\Policies\Explorer\Run: [DllHst] C:\DOCUME~1\MATT&B~1\LOCALS~1\APPLIC~1\MICROS~1\dllhst3g.exe /waitservice
O4 - HKCU\..\Policies\Explorer\Run: [Spool] C:\DOCUME~1\MATT&B~1\LOCALS~1\APPLIC~1\MICROS~1\spoolsv.exe /waitservice
O4 - HKCU\..\Policies\Explorer\Run: [Cisvc] C:\DOCUME~1\MATT&B~1\APPLIC~1\MICROS~1\cisvc.exe /waitservice
O4 - HKCU\..\Policies\Explorer\Run: [Logman] C:\DOCUME~1\MATT&B~1\APPLIC~1\MICROS~1\logman.exe /waitservice
O4 - HKCU\..\Policies\Explorer\Run: [IEudinit] C:\DOCUME~1\MATT&B~1\APPLIC~1\ieudinit.exe /waitservice
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 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\S-1-5-18\..\Policies\Explorer\Run: [Cisvc] C:\DOCUME~1\MATT&B~1\APPLIC~1\cisvc.exe /waitservice (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - HKUS\.DEFAULT\..\Policies\Explorer\Run: [Cisvc] C:\DOCUME~1\MATT&B~1\APPLIC~1\cisvc.exe /waitservice (User 'Default user')
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = E:\ADOBE Acrobat Reader\Installation\Reader\reader_sl.exe
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - E:\OFFICE~1\INSTAL~1\OFFICE11\REFIEBAR.DLL
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
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Planificateur Avira AntiVir Personal - Free Antivirus (AntiVirScheduler) - Avira GmbH - E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\sched.exe
O23 - Service: Avira AntiVir Personal - Free Antivirus Guard (AntiVirService) - Avira GmbH - E:\Antivirus & Firewall\Antivir\Installation\Avira\AntiVir PersonalEdition Classic\avguard.exe
O23 - Service: Apple Mobile Device - Apple Inc. - C:\Program Files\Fichiers communs\Apple\Mobile Device Support\bin\AppleMobileDeviceService.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - ALWIL Software - E:\Antivirus & Firewall\Avast\Installation\aswUpdSv.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: avast! Antivirus - ALWIL Software - E:\Antivirus & Firewall\Avast\Installation\ashServ.exe
O23 - Service: avast! Mail Scanner - ALWIL Software - E:\Antivirus & Firewall\Avast\Installation\ashMaiSv.exe
O23 - Service: avast! Web Scanner - ALWIL Software - E:\Antivirus & Firewall\Avast\Installation\ashWebSv.exe
O23 - Service: Service Bonjour (Bonjour Service) - Apple Inc. - C:\Program Files\Bonjour\mDNSResponder.exe
O23 - Service: FLEXnet Licensing Service - Acresso Software Inc. - C:\Program Files\Fichiers communs\Macrovision Shared\FLEXnet Publisher\FNPLicensingService.exe
O23 - Service: Service de l’iPod (iPod Service) - Apple Inc. - C:\Program Files\iPod\bin\iPodService.exe
O23 - Service: Java Quick Starter (JavaQuickStarterService) - Sun Microsystems, Inc. - C:\Program Files\Java\jre6\bin\jqs.exe
--
End of file - 8636 bytes
MERCI !
