Bonjour,  
 
quelqu'un pourait-il m'expliquer pourquoi le process lsass.exe peut utiliser en permanence au moins 40% de mon temps CPU ? Cela ralentit considérablement ma machine.
 
Je n'ai apriori pas de virus connu, ni de spy, ci joint le log HiJackThis (déjà analysé en ligne -> clean):
 
Logfile of HijackThis v1.99.1
Scan saved at 00:10:52, on 16/05/2005
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
 
Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\csrss.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\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
C:\Program Files\Network Associates\VirusScan\Mcshield.exe
C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
C:\Program Files\Fichiers communs\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\wdfmgr.exe
C:\PROGRA~1\NETWOR~1\COMMON~1\naPrdMgr.exe
C:\WINDOWS\System32\alg.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE
C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATI9HE.EXE
C:\WINDOWS\system32\devldr32.exe
C:\Program Files\ATI Multimedia\main\ATIDtct.EXE
C:\Program Files\Webroot\Spy Sweeper\SpySweeper.exe
C:\Program Files\Fichiers communs\DataViz\DvzIncMsgr.exe
C:\Program Files\palmOne\Hotsync.exe
C:\Program Files\BHODemon 2\BHODemon.exe
C:\WINDOWS\system32\taskmgr.exe
C:\Program Files\Internet Explorer\iexplore.exe
E:\Master\Securite\HijackThis\HijackThis.exe
 
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\Spybot\SDHelper.dll
O2 - BHO: EpsonToolBandKicker Class - {E99421FB-68DD-40F0-B4AC-B7027CAE2F1A} - C:\Program Files\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O3 - Toolbar: EPSON Web-To-Page - {EE5D279F-081B-4404-994D-C6B60AAEBA6D} - C:\Program Files\EPSON\EPSON Web-To-Page\EPSON Web-To-Page.dll
O4 - HKLM\..\Run: [ATIPTA] C:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [ShStatEXE] "C:\Program Files\Network Associates\VirusScan\SHSTAT.EXE" /STANDALONE
O4 - HKLM\..\Run: [McAfeeUpdaterUI] "C:\Program Files\Network Associates\Common Framework\UpdaterUI.exe"
O4 - HKLM\..\Run: [EPSON Stylus Photo RX620 Series] C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\E_FATI9HE.EXE /P31 "EPSON Stylus Photo RX620 Series" /O6 "USB001" /M "Stylus Photo RX620"
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKCU\..\Run: [ATI DeviceDetect] C:\Program Files\ATI Multimedia\main\ATIDtct.EXE
O4 - Startup: BHODemon 2.0.lnk = C:\Program Files\BHODemon 2\BHODemon.exe
O4 - Global Startup: DataViz Inc Messenger.lnk = C:\Program Files\Fichiers communs\DataViz\DvzIncMsgr.exe
O4 - Global Startup: HotSync Manager.lnk = C:\Program Files\palmOne\Hotsync.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: ATI TV - {44226DFF-747E-4edc-B30C-78752E50CD0C} - C:\Program Files\ATI Multimedia\tv\EXPLBAR.DLL
O9 - Extra button: Recherche - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.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://v5.windowsupdate.microsoft. [...] 3050142906
O17 - HKLM\System\CCS\Services\Tcpip\..\{506F7F0F-B602-47F5-876D-9F4460A8587B}: NameServer = 10.0.0.138
O17 - HKLM\System\CS1\Services\Tcpip\..\{506F7F0F-B602-47F5-876D-9F4460A8587B}: NameServer = 10.0.0.138
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: McAfee Framework Service (McAfeeFramework) - Network Associates, Inc. - C:\Program Files\Network Associates\Common Framework\FrameworkService.exe
O23 - Service: Network Associates McShield (McShield) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\Mcshield.exe
O23 - Service: Network Associates Task Manager (McTaskManager) - Network Associates, Inc. - C:\Program Files\Network Associates\VirusScan\VsTskMgr.exe
 
Merci d'avance.