Problème avec virus "downloaad.trojan"

mesdames et messieurs, Bonsoir
Gros soucis avec virus "download.trojan" dans WINNt/system32.pif.ci-joint rapport de Hijackthis
Logfile of HijackThis v1.98.2
Scan saved at 18:49:00, on 23/11/2004
Platform: Windows XP SP1 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

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\spoolsv.exe
C:\Program Files\TOSHIBA\Power Management\CeEPwrSvc.exe
C:\Program Files\TOSHIBA\ConfigFree\CFSvcs.exe
C:\WINDOWS\System32\DVDRAMSV.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\Firewall\PavFires.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\pavsrv51.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\apvxdwin.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\System32\Winupdsys.exe
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Program Files\Apoint2K\Apoint.exe
C:\Program Files\ltmoh\Ltmoh.exe
C:\WINDOWS\AGRSMMSG.exe
C:\Program Files\TOSHIBA\Power Management\CePMTray.exe
C:\PROGRA~1\EzButton\CPLDFL10.EXE
C:\Program Files\TOSHIBA\E-KEY\CeEKey.exe
C:\Program Files\TOSHIBA\TouchPad\TPTray.exe
C:\Program Files\TOSHIBA\ConfigFree\NDSTray.exe
C:\Program Files\MusicMatch\MusicMatch Jukebox\mmtask.exe
C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mm_tray.exe
C:\WINDOWS\system32\ezSP_Px.exe
C:\WINDOWS\System32\lssrv.exe
C:\WINDOWS\System32\sepate.exe
C:\Program Files\Apoint2K\Apntex.exe
C:\Program Files\Logitech\MouseWare\system\em_exec.exe
C:\Program Files\Fichiers communs\CMEII\CMESys.exe
C:\Program Files\Soft4Ever\looknstop\looknstop.exe
C:\Program Files\TOSHIBA\TOSCDSPD\toscdspd.exe
C:\Program Files\Messenger\msmsgs.exe
C:\WINDOWS\System32\ctfmon.exe
C:\Program Files\SuperCopier\SuperCopier.exe
C:\WINDOWS\System32\sepate.exe
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files\FinePixViewer\QuickDCF.exe
C:\WINDOWS\system32\RAMASST.exe
C:\Program Files\Fichiers communs\GMT\GMT.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\pavProxy.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\AVENGINE.EXE
C:\WINDOWS\System32\wuauclt.exe
C:\Program Files\Panda Software\Panda Antivirus Platinum\Upgrader.exe
E:\HijackThis v1_98_2.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.google.fr/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 6.0\Reader\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: Easy-WebPrint - {327C2873-E90D-4c37-AA9D-10AC9BABA46C} - C:\Program Files\Canon\Easy-WebPrint\Toolband.dll
O3 - Toolbar: &Radio - {8E718888-423F-11D2-876E-00A0C9082467} - C:\WINDOWS\system32\msdxm.ocx
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [ATIModeChange] Ati2mdxx.exe
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [Apoint] C:\Program Files\Apoint2K\Apoint.exe
O4 - HKLM\..\Run: [LtMoh] C:\Program Files\ltmoh\Ltmoh.exe
O4 - HKLM\..\Run: [AGRSMMSG] AGRSMMSG.exe
O4 - HKLM\..\Run: [CeEPOWER] C:\Program Files\TOSHIBA\Power Management\CePMTray.exe
O4 - HKLM\..\Run: [CPLDFL10] C:\PROGRA~1\EzButton\CPLDFL10.EXE
O4 - HKLM\..\Run: [CeEKEY] C:\Program Files\TOSHIBA\E-KEY\CeEKey.exe
O4 - HKLM\..\Run: [TPNF] C:\Program Files\TOSHIBA\TouchPad\TPTray.exe
O4 - HKLM\..\Run: [NDSTray.exe] NDSTray.exe
O4 - HKLM\..\Run: [Logitech Utility] Logi_MwX.Exe
O4 - HKLM\..\Run: [mmtask] c:\Program Files\MusicMatch\MusicMatch Jukebox\mmtask.exe
O4 - HKLM\..\Run: [MMTray] C:\Program Files\MUSICMATCH\MUSICMATCH Jukebox\mm_tray.exe
O4 - HKLM\..\Run: [REGSHAVE] C:\Program Files\REGSHAVE\REGSHAVE.EXE /AUTORUN
O4 - HKLM\..\Run: [ezShieldProtector for Px] C:\WINDOWS\system32\ezSP_Px.exe
O4 - HKLM\..\Run: [DIABLO666] Winupdsys.exe
O4 - HKLM\..\Run: [Microsoft Services] lssrv.exe
O4 - HKLM\..\Run: [Sepate Security Firewall] sepate.exe
O4 - HKLM\..\Run: [CMESys] "C:\Program Files\Fichiers communs\CMEII\CMESys.exe"
O4 - HKLM\..\Run: [Look 'n' Stop] "C:\Program Files\Soft4Ever\looknstop\looknstop.exe" -auto
O4 - HKLM\..\Run: [NAV Agent] C:\PROGRA~1\NORTON~1\NORTON~1\navapw32.exe
O4 - HKLM\..\RunServices: [DIABLO666] Winupdsys.exe
O4 - HKLM\..\RunServices: [Microsoft Services] lssrv.exe
O4 - HKLM\..\RunServices: [Sepate Security Firewall] sepate.exe
O4 - HKLM\..\RunOnce: [DIABLO666] Winupdsys.exe
O4 - HKCU\..\Run: [TOSCDSPD] C:\Program Files\TOSHIBA\TOSCDSPD\toscdspd.exe
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\System32\ctfmon.exe
O4 - HKCU\..\Run: [SuperCopier.exe] C:\Program Files\SuperCopier\SuperCopier.exe
O4 - HKCU\..\Run: [DIABLO666] Winupdsys.exe
O4 - HKCU\..\Run: [Sepate Security Firewall] sepate.exe
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - HKCU\..\RunOnce: [DIABLO666] Winupdsys.exe
O4 - Global Startup: Exif Launcher.lnk = C:\Program Files\FinePixViewer\QuickDCF.exe
O4 - Global Startup: GStartup.lnk = C:\Program Files\Fichiers communs\GMT\GMT.exe
O4 - Global Startup: Lancement rapide de Microsoft Office OneNote 2003.lnk = C:\Program Files\Microsoft Office\OFFICE11\ONENOTEM.EXE
O4 - Global Startup: Logitech Desktop Messenger.lnk = C:\Program Files\Logitech\Desktop Messenger\8876480\Program\LDMConf.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O4 - Global Startup: RAMASST.lnk = C:\WINDOWS\system32\RAMASST.exe
O8 - Extra context menu item: &Google Search - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsearch.html
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O8 - Extra context menu item: Easy-WebPrint Ajouter à la Liste à Imprimer - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_AddToList.html
O8 - Extra context menu item: Easy-WebPrint Impression rapide - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_HSPrint.html
O8 - Extra context menu item: Easy-WebPrint Imprimer - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Print.html
O8 - Extra context menu item: Easy-WebPrint Prévisualiser - res://C:\Program Files\Canon\Easy-WebPrint\Resource.dll/RC_Preview.html
O8 - Extra context menu item: Pages liées - res://C:\Program Files\Google\GoogleToolbar1.dll/cmbacklinks.html
O8 - Extra context menu item: Pages similaires - res://C:\Program Files\Google\GoogleToolbar1.dll/cmsimilar.html
O8 - Extra context menu item: Version de la page actuelle disponible dans le cache Google - res://C:\Program Files\Google\GoogleToolbar1.dll/cmcache.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - (no file)
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - (no file)
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINDOWS\web\related.htm
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://v5.windowsupdate.microsoft.com/v5consumer/V5Controls/en/x86/client/wuweb_site.cab?1099032425484
O16 - DPF: {644E432F-49D3-41A1-8DD5-E099162EEEC5} (Symantec RuFSI Utility Class) - http://security.symantec.com/sscv6/SharedContent/common/bin/cabsa.cab

merci d'avance pour l'aide futur apporté et bonne soirée à tous