Bonjour,
Je n'arrive plus à ouvrir Internet Explorer mais Mozilla Firefox s'ouvre sans pb. J'ai donc voulu supprimer IE8 mais impossible. Impossible également de réinstaller. J'ai également voulu réinstaller IE7 mais il ne s'ouvre pas non plus.
Ci-joint rapport HijackThis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 09:42:28, on 11/11/2009
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.5730.0011)
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:\windows\System32\svchost.exe
C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
C:\Program Files\Intel\Wireless\Bin\S24EvMon.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\windows\system32\spoolsv.exe
C:\Program Files\TOSHIBA\ConfigFree\CFSvcs.exe
C:\windows\eHome\ehRecvr.exe
C:\windows\eHome\ehSched.exe
C:\windows\System32\FTRTSVC.exe
C:\Program Files\iolo\common\lib\ioloServiceManager.exe
C:\windows\system32\nvsvc32.exe
C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
C:\windows\system32\svchost.exe
C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
C:\windows\system32\SearchIndexer.exe
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
C:\WINDOWS\system32\dllhost.exe
C:\windows\Explorer.EXE
C:\Program Files\TOSHIBA\ConfigFree\NDSTray.exe
C:\WINDOWS\System32\DLA\DLACTRLW.EXE
C:\Program Files\Intel\Wireless\bin\ZCfgSvc.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\Program Files\Winamp\winampa.exe
C:\windows\system32\ctfmon.exe
C:\Program Files\Fichiers communs\Nero\Lib\NMIndexStoreSvr.exe
C:\Program Files\Windows Desktop Search\WindowsSearch.exe
C:\Documents and Settings\LoLo\Application Data\Microsoft\Notification de cadeaux MSN\lsnfier.exe
C:\Program Files\Microsoft Office\Office12\ONENOTEM.EXE
C:\Program Files\Wanadoo\GestionnaireInternet.exe
C:\Program Files\Wanadoo\ComComp.exe
C:\PROGRA~1\Wanadoo\Toaster.exe
C:\PROGRA~1\Wanadoo\Inactivity.exe
C:\PROGRA~1\Wanadoo\PollingModule.exe
C:\PROGRA~1\Wanadoo\ALERTM~1.EXE
C:\Program Files\Fichiers communs\Nero\Lib\NMIndexingService.exe
C:\PROGRA~1\Intel\Wireless\Bin\Dot1XCfg.exe
C:\Program Files\Wanadoo\Watch.exe
C:\Program Files\Giganology\Gigaget\Gigaget.exe
C:\windows\system32\SearchProtocolHost.exe
C:\Program Files\Trend Micro\HijackThis\HijackThis.exe

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
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.incredimail.com/...
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
R3 - URLSearchHook: Winamp Search Class - {57BCA5FA-5DBB-45a2-B558-1755C3F6253B} - C:\Program Files\Winamp Toolbar\winamptb.dll
R3 - URLSearchHook: Search Class - {08C06D61-F1F3-4799-86F8-BE1A89362C85} - C:\PROGRA~1\Wanadoo\SEARCH~1.DLL
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: GigagetIEHelper - {111CAA23-6F4F-42AC-8555-B48C1D87BBAB} - C:\WINDOWS\system32\gigagetbho_v10.dll
O2 - BHO: (no name) - {5C255C8A-E604-49b4-9D64-90988571CECB} - (no file)
O2 - BHO: DriveLetterAccess - {5CA3D70E-1895-11CF-8E15-001234567890} - C:\WINDOWS\System32\DLA\DLASHX_W.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: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [nwiz] nwiz.exe /installquiet
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [High Definition Audio Property Page Shortcut] CHDAudPropShortcut.exe
O4 - HKLM\..\Run: [NDSTray.exe] NDSTray.exe
O4 - HKLM\..\Run: [DLA] C:\WINDOWS\System32\DLA\DLACTRLW.EXE
O4 - HKLM\..\Run: [IntelZeroConfig] "C:\Program Files\Intel\Wireless\bin\ZCfgSvc.exe"
O4 - HKLM\..\Run: [avast!] C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
O4 - HKLM\..\Run: [Gigaget] "C:\Program Files\Giganology\Gigaget\GigagetShell.exe" /s
O4 - HKLM\..\Run: [IncrediMail] IncMail.exe /c
O4 - HKLM\..\Run: [WinampAgent] "C:\Program Files\Winamp\winampa.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\windows\system32\ctfmon.exe
O4 - HKCU\..\Run: [IndxStoreSvr_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files\Fichiers communs\Nero\Lib\NMIndexStoreSvr.exe" ASO-616B5711-6DAE-4795-A05F-39A1E5104020
O4 - HKCU\..\Run: [WOOKIT] C:\Program Files\Wanadoo\GestMaj.exe GestionnaireInternet.exe
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\.DEFAULT\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Startup: Notification de cadeaux MSN.lnk = C:\Documents and Settings\LoLo\Application Data\Microsoft\Notification de cadeaux MSN\lsnfier.exe
O4 - Startup: OneNote 2007 - Capture d'écran et lancement.lnk = C:\Program Files\Microsoft Office\Office12\ONENOTEM.EXE
O4 - Global Startup: Booster Orange.lnk = C:\Program Files\Booster Wanadoo\wanadoo_booster.exe
O4 - Global Startup: Windows Search.lnk = C:\Program Files\Windows Desktop Search\WindowsSearch.exe
O8 - Extra context menu item: &Winamp Search - C:\Documents and Settings\All Users\Application Data\Winamp Toolbar\ieToolbar\resources\en-US\local\search.html
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_04\bin\npjpi150_04.dll
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
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://www.update.microsoft.com/...
O17 - HKLM\System\CCS\Services\Tcpip\..\{79963A9C-7429-4EC4-8FCC-AC9FF9227D33}: NameServer = 80.10.246.5 80.10.246.136
O17 - HKLM\System\CCS\Services\Tcpip\..\{CEE64758-014D-49E4-B0F2-4B8B564D34E1}: NameServer = 208.67.222.222,208.67.222.220
O18 - Protocol: CDS300 - {AD43AA67-6860-4531-AC8A-0E68F9CF023E} - F:\Player\__CDS2.dll (file missing)
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O23 - Service: ASKUpgrade - Unknown owner - C:\Program Files\AskBarDis\bar\bin\ASKUpgrade.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: ConfigFree Service (CFSvcs) - TOSHIBA CORPORATION - C:\Program Files\TOSHIBA\ConfigFree\CFSvcs.exe
O23 - Service: Intel(R) PROSet/Wireless Event Log (EvtEng) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\EvtEng.exe
O23 - Service: France Telecom Routing Table Service (FTRTSVC) - France Telecom - C:\windows\System32\FTRTSVC.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: iolo FileInfoList Service (ioloFileInfoList) - Unknown owner - C:\Program Files\iolo\common\lib\ioloServiceManager.exe
O23 - Service: iolo System Service (ioloSystemService) - Unknown owner - C:\Program Files\iolo\common\lib\ioloServiceManager.exe
O23 - Service: NMIndexingService - Nero AG - C:\Program Files\Fichiers communs\Nero\Lib\NMIndexingService.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\windows\system32\nvsvc32.exe
O23 - Service: Intel(R) PROSet/Wireless Registry Service (RegSrvc) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
O23 - Service: Intel(R) PROSet/Wireless Service (S24EventMonitor) - Intel Corporation - C:\Program Files\Intel\Wireless\Bin\S24EvMon.exe
O23 - Service: X10 Device Network Service (x10nets) - X10 - C:\PROGRA~1\COMMON~1\X10\Common\x10nets.exe
End of file - 9100 bytes

Configuration: Windows XP
Firefox 3.0.15