Mon ordi bloque, je dois redemarer avec le RESET

Bonjour,
Voila mon problème : A n'importe quel moment l'ordinateur se bloque : la souris ne répond plus, ni le CTRL+ALT+SUPPR. Je dois donc appuyer sur le RESET pour le faire redemarer.

Merci de votre aide

Caracteristique de l'ordi : WINDOWS XP PRO 2002, service pack 2
Processeur : AMD ATHLON (tm) Process

j'ai installer hijackThis et voila le log :

Logfile of HijackThis v1.99.1
Scan saved at 20:53:26, on 11/03/2006
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\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:\WINDOWS\system32\Ati2evxx.exe
C:\WINDOWS\Explorer.EXE
C:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
C:\WINDOWS\system32\ircomm2k.exe
C:\WINDOWS\system32\svchost.exe
C:\PROGRA~1\TECHCI~1\AOLSAV\AOLAgent.exe
C:\Program Files\Fichiers communs\AOL\ACS\AOLDial.exe
C:\WINDOWS\Mixer.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpohmr08.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpotdd01.exe
C:\Program Files\Wireless\Client Manager\CMags.EXE
C:\Program Files\MicroStar\WLANUtility\WlanUtility.exe
C:\Program Files\Fichiers communs\AOL\1140359161\ee\AOLHostManager.exe
C:\Program Files\Fichiers communs\AOL\1140359161\ee\AOLServiceHost.exe
C:\Program Files\OpenOffice.org 2.0\program\soffice.exe
C:\Program Files\OpenOffice.org 2.0\program\soffice.BIN
C:\Program Files\MicroStar\WLANUtility\WLAN_Service.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\bin\hpoevm08.exe
c:\program files\fichiers communs\aol\1140359161\ee\services\antiSpywareApp\ver2_0_12\AOLSP Scheduler.exe
C:\Program Files\Fichiers communs\AOL\1140359161\ee\AOLServiceHost.exe
C:\Program Files\Hewlett-Packard\Digital Imaging\Bin\hpoSTS08.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\AOL 9.0\waol.exe
C:\Program Files\AOL 9.0\shellmon.exe
C:\Program Files\Fichiers communs\Aol\aoltpspd.exe
C:\Documents and Settings\Mayane\Local Settings\Temporary Internet Files\Content.IE5\OHA7OLYN\HijackThis[1].exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://runonce.msn.com/?v=msgrv75
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://www.files-ftp.com/~unicorni/phpBB2/index.php
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
F3 - REG:win.ini: run=
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar2.dll
O2 - BHO: Burn4Free Toolbar Helper - {F8E5CA21-C27B-43e7-B2BE-4CA93C9F9A1F} - C:\Program Files\Burn4Free Toolbar\v2.0.0.4\Burn4Free_Toolbar.dll
O3 - Toolbar: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: Burn4Free Toolbar - {70DE7956-479D-4eb7-8641-2B45774C350E} - C:\Program Files\Burn4Free Toolbar\v2.0.0.4\Burn4Free_Toolbar.dll
O4 - HKLM\..\Run: [AOLSAV] C:\PROGRA~1\TECHCI~1\AOLSAV\AOLAgent.exe
O4 - HKLM\..\Run: [AOLDialer] C:\Program Files\Fichiers communs\AOL\ACS\AOLDial.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [C-Media Mixer] Mixer.exe /startup
O4 - HKLM\..\Run: [KAVPersonal50] C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal\kav.exe /minimize
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [HostManager] C:\Program Files\Fichiers communs\AOL\1140359161\ee\AOLHostManager.exe
O4 - HKCU\..\Run: [MA Handset Manager] "C:\Program Files\Mobile Action\903SH_703SH USB-Handset Manager\PanelExe.exe" /HIDE
O4 - HKCU\..\Run: [updateMgr] C:\Program Files\Adobe\Acrobat 7.0\Reader\AdobeUpdateManager.exe AcRdB7_0_5
O4 - Startup: OpenOffice.org 2.0.lnk = C:\Program Files\OpenOffice.org 2.0\program\quickstart.exe
O4 - Global Startup: AOL 9.0 Icône AOL.lnk = C:\Program Files\AOL 9.0\aoltray.exe
O4 - Global Startup: hp psc 1000 series.lnk = ?
O4 - Global Startup: hpoddt01.exe.lnk = ?
O4 - Global Startup: Lancement rapide d'Adobe Reader.lnk = C:\Program Files\Adobe\Acrobat 7.0\Reader\reader_sl.exe
O4 - Global Startup: Wireless Client Manager.lnk = ?
O4 - Global Startup: WlanUtility.lnk = C:\Program Files\MicroStar\WLANUtility\WlanUtility.exe
O6 - HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions present
O8 - Extra context menu item: &Google Search - res://c:\program files\google\GoogleToolbar2.dll/cmsearch.html
O8 - Extra context menu item: &Recherche AOL Toolbar - res://C:\Program Files\AOL Toolbar\toolbar.dll/SEARCH.HTML
O8 - Extra context menu item: Pages liées - res://c:\program files\google\GoogleToolbar2.dll/cmbacklinks.html
O8 - Extra context menu item: Pages similaires - res://c:\program files\google\GoogleToolbar2.dll/cmsimilar.html
O8 - Extra context menu item: Version de la page actuelle disponible dans le cache Google - res://c:\program files\google\GoogleToolbar2.dll/cmcache.html
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O9 - Extra button: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O9 - Extra 'Tools' menuitem: AOL Toolbar - {4982D40A-C53B-4615-B15B-B5B5E98D167C} - C:\Program Files\AOL Toolbar\toolbar.dll
O9 - Extra button: Real.com - {CD67F990-D8E9-11d2-98FE-00C0F0318AFE} - C:\WINDOWS\system32\Shdocvw.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
O14 - IERESET.INF: START_PAGE_URL=http://www.files-ftp.com/~unicorni/phpBB2/index.php
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {288C5F13-7E52-4ADA-A32E-F5BF9D125F99} (CR64Loader Object) - http://miniclip.com/puzzlepirates/ [...] Loader.dll
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {A18962F6-E6ED-40B1-97C9-1FB36F38BFA8} (Aurigma Image Uploader 3.5 Control) - http://www.photoways.com/clients/ImageUploader3.cab
O16 - DPF: {B38870E4-7ECB-40DA-8C6A-595F0A5519FF} (MsnMessengerSetupDownloadControl Class) - http://messenger.msn.com/download/ [...] loader.cab
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: AOL Connectivity Service (AOL ACS) - America Online, Inc. - C:\PROGRA~1\FICHIE~1\AOL\ACS\AOLacsd.exe
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: Virtueller Infrarot-Kommunikationsanschluß, Dienstprogramm (IrCOMM2kSvc) - Jan Kiszka - C:\WINDOWS\system32\ircomm2k.exe
O23 - Service: kavsvc - Kaspersky Labs - C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus Personal\kavsvc.exe
O23 - Service: Pml Driver HPZ12 - HP - C:\WINDOWS\system32\HPZipm12.exe