Bonjour,
Depuis quelque temps, je ne peux plus ouvrir de nombreuses applications sur mon ordinateur. A chaque fois, windows me demande avec quel programme je veux ouvrir tel ou tel fichier 
Même quand je double clique sur mon disque dur C:, il me propose de choisir avec quel programme je veux ouvrir le fichier...
J'ai fait une analyse Hijackthis dont voici le rapport :
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 09:52:09, on 16/07/2009
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
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\Intel\Wireless\Bin\WLKeeper.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
C:\Program Files\Symantec\Backup Exec System Recovery\Agent\VProSvc.exe
C:\PROGRA~1\FICHIE~1\France Telecom\Shared Modules\FTRTSVC\0\FTRTSVC.exe
C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqld-nt.exe
C:\Program Files\OpenERP AllInOne\Server\service\OpenERPServerService.exe
C:\Program Files\OpenERP AllInOne\Server\openerp-server.exe
C:\Program Files\Intel\Wireless\Bin\RegSrvc.exe
C:\WINDOWS\system32\dllhost.exe
C:\Program Files\UltraVNC\WinVNC.exe
C:\WINDOWS\System32\WLTRYSVC.EXE
C:\WINDOWS\System32\bcmwltry.exe
C:\WINDOWS\system32\dllhost.exe
C:\Program Files\Symantec\Backup Exec System Recovery\Shared\Drivers\SymSnapService.exe
C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\Fichiers communs\InstallShield\UpdateService\issch.exe
C:\Program Files\Symantec\Backup Exec System Recovery\Agent\VProTray.exe
C:\Program Files\Adobe\Photoshop Album Edition Découverte\3.0\Apps\apdproxy.exe
C:\Program Files\Winamp\winampa.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Skype\Phone\Skype.exe
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files\LaCie\Genie Backup Manager Pro\GBMAgent.exe
C:\Program Files\Microsoft Office\Office\OSA.EXE
C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Skype\Plugin Manager\SkypePM.exe
C:\WINDOWS\explorer.exe
C:\Program Files\Microsoft Office\Office\MSACCESS.EXE
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Documents and Settings\marc\Bureau\HiJackThis.exe
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.yahoo.fr/
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:\Program Files\Orange\SearchURLHook\SearchPageURL.dll
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: Winamp Toolbar Loader - {25CEE8EC-5730-41bc-8B58-22DDC8AB8C20} - C:\Program Files\Winamp Toolbar\winamptb.dll
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O3 - Toolbar: Winamp Toolbar - {EBF2BA02-9094-4c5a-858B-BB198F3D8DE2} - C:\Program Files\Winamp Toolbar\winamptb.dll
O4 - HKLM\..\Run: [AVP] "C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe"
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [ISUSPM Startup] C:\PROGRA~1\FICHIE~1\INSTAL~1\UPDATE~1\ISUSPM.exe -startup
O4 - HKLM\..\Run: [ISUSScheduler] "C:\Program Files\Fichiers communs\InstallShield\UpdateService\issch.exe" -start
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "C:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [Symantec Backup Exec System Recovery 8.0] "C:\Program Files\Symantec\Backup Exec System Recovery\Agent\VProTray.exe"
O4 - HKLM\..\Run: [Adobe Photo Downloader] "C:\Program Files\Adobe\Photoshop Album Edition Découverte\3.0\Apps\apdproxy.exe"
O4 - HKLM\..\Run: [WinampAgent] "C:\Program Files\Winamp\winampa.exe"
O4 - HKLM\..\Run: [GBMPro8AgentLaCie] C:\Program Files\LaCie\Genie Backup Manager Pro\GBMAgent.exe
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKCU\..\Run: [AdobeUpdater] C:\Program Files\Fichiers communs\Adobe\Updater5\AdobeUpdater.exe
O4 - HKCU\..\Run: [GBMPro8AgentLaCie] C:\Program Files\LaCie\Genie Backup Manager Pro\GBMAgent.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-1-5-21-823518204-651377827-839522115-1006\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\CTFMON.EXE (User 'openpgsvc')
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 - Global Startup: Démarrage d'Office.lnk = C:\Program Files\Microsoft Office\Office\OSA.EXE
O4 - Global Startup: Microsoft Recherche accélérée.lnk = C:\Program Files\Microsoft Office\Office\FINDFAST.EXE
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel present
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: Ajouter à Kaspersky Anti-Banner - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\ie_banner_deny.htm
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: Statistiques d’Anti-Virus Internet - {1F460357-8A94-4D71-9CA3-AA4ACF32ED8E} - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\SCIEPlgn.dll
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.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
O9 - Extra button: Orange - {1462651F-F4BA-4C76-A001-C4284D0FE16E} - http://www.orange.fr (file missing) (HKCU)
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/window [...] 7573117140
O16 - DPF: {88764F69-3831-4EC1-B40B-FF21D8381345} (AdVerifierADPCtrl Class) - https://static.impots.gouv.fr/tdir/ [...] DP-1.0.cab
O16 - DPF: {B79A53C0-1DAC-4636-BACE-FD086A7A79BF} (AdSignerLCContrl Class) - https://static.impots.gouv.fr/tdir/ [...] DP-1.1.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{0DA08B53-1C61-4B14-B113-2BF2FA154C59}: NameServer = 212.30.96.108,192.168.1.254
O17 - HKLM\System\CS1\Services\Tcpip\..\{0DA08B53-1C61-4B14-B113-2BF2FA154C59}: NameServer = 212.30.96.108,192.168.1.254
O17 - HKLM\System\CS4\Services\Tcpip\..\{0DA08B53-1C61-4B14-B113-2BF2FA154C59}: NameServer = 212.30.96.108,192.168.1.254
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\FICHIE~1\Skype\SKYPE4~1.DLL
O20 - AppInit_DLLs: C:\PROGRA~1\KASPER~1\KASPER~1.0FO\adialhk.dll
O23 - Service: Kaspersky Anti-Virus 6.0 (AVP) - Kaspersky Lab - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0 for Windows Workstations\avp.exe
O23 - Service: Backup Exec System Recovery - Symantec Corporation - C:\Program Files\Symantec\Backup Exec System Recovery\Agent\VProSvc.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 SA - C:\PROGRA~1\FICHIE~1\France Telecom\Shared Modules\FTRTSVC\0\FTRTSVC.exe
O23 - Service: LiveUpdate - Symantec Corporation - C:\PROGRA~1\Symantec\LIVEUP~1\LUCOMS~1.EXE
O23 - Service: MySQL - Unknown owner - C:\Program.exe (file missing)
O23 - Service: OpenERP Server (openerp-service) - Unknown owner - C:\Program Files\OpenERP AllInOne\Server\service\OpenERPServerService.exe
O23 - Service: OpenERP Web (openerp-web) - Unknown owner - C:\Program Files\OpenERP AllInOne\Web\python25\PythonService.exe
O23 - Service: OpenVPN Service (OpenVPNService) - Unknown owner - C:\Program Files\OpenVPN\bin\openvpnserv.exe
O23 - Service: PostgreSQL4OpenERP (pgsql-8.3) - PostgreSQL Global Development Group - C:\Program Files\OpenERP AllInOne\PostgreSQL\bin\pg_ctl.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: SymSnapService - Symantec - C:\Program Files\Symantec\Backup Exec System Recovery\Shared\Drivers\SymSnapService.exe
O23 - Service: VNC Server (winvnc) - UltraVNC - C:\Program Files\UltraVNC\WinVNC.exe
O23 - Service: Intel(R) PROSet/Wireless SSO Service (WLANKEEPER) - Intel(R) Corporation - C:\Program Files\Intel\Wireless\Bin\WLKeeper.exe
O23 - Service: Dell Wireless WLAN Tray Service (wltrysvc) - Unknown owner - C:\WINDOWS\System32\WLTRYSVC.EXE
--
End of file - 9842 bytes
J'espère que vous saurez m'aider.
Cordialement,
