Mon pc s'arrete brutalement .Je ne sais pas quoi faire .Merci de m'aider svp

mon cpu tourne à 65° (pentium 4 2.93ghz) et je pense que c'est ca qui fait que mon pc s'arrete mais cela peut aussi venir d'un virus
voici mon log hijackthis
merci

Logfile of HijackThis v1.99.1
Scan saved at 09:16:35, on 25/06/2006
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\svchost.exe
C:\Program Files\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
c:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
c:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\windows\system\hpsysdrv.exe
C:\WINDOWS\RTHDCPL.EXE
C:\HP\KBD\KBD.EXE
C:\WINDOWS\system32\rundll32.exe
C:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe
C:\Program Files\HP\HP Software Update\HPwuSchd2.exe
C:\Program Files\Windows Defender\MSASCui.exe
C:\Program Files\WinPortrait\wpctrl.exe
C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe
C:\program files\powerstrip\pstrip.exe
C:\WINDOWS\arservice.exe
C:\Program Files\Portrait Displays\forteManager\dtsslsrv.exe
C:\Program Files\MSN Messenger\msnmsgr.exe
C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
C:\Program Files\Alwil Software\Avast4\ashServ.exe
C:\Program Files\Portrait Displays\forteManager\DTSRVC.exe
C:\WINDOWS\eHome\ehRecvr.exe
C:\WINDOWS\eHome\ehSched.exe
C:\Program Files\ewido anti-malware\ewidoctrl.exe
C:\Program Files\Everydev\Facilosave 2006\Faciloservice.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\WinPortrait\floater.exe
C:\WINDOWS\system32\svchost.exe
c:\Program Files\Fichiers communs\Symantec Shared\Security Center\SymWSC.exe
C:\WINDOWS\system32\dllhost.exe
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe
c:\Program Files\Fichiers communs\Symantec Shared\Security Center\SymSCUI.exe
C:\Program Files\Lavalys\EVEREST Home Edition\everest.bin
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Documents and Settings\HP_Administrateur\Bureau\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\about.htm
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://configuration.adsl/
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Window Title = Wanadoo
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = 127.0.0.1:8080
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
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: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.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
O3 - Toolbar: Barre d'outils MSN - {BDAD1DAD-C946-4A17-ADC1-64B5B4FF55D0} - C:\Program Files\MSN Toolbar\01.01.2607.0\fr\msntb.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar2.dll
O3 - Toolbar: Yahoo! Toolbar - {EF99BD32-C1FB-11D2-892F-0090271D4F88} - C:\Program Files\Yahoo!\Companion\Installs\cpn\yt.dll
O4 - HKLM\..\Run: [ftutil2] "rundll32.exe " ftutil2.dll,SetWriteCacheMode
O4 - HKLM\..\Run: [AlwaysReady Power Message APP] "ARPWRMSG.EXE"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe"
O4 - HKLM\..\Run: [hpsysdrv] "c:\windows\system\hpsysdrv.exe"
O4 - HKLM\..\Run: [RTHDCPL] "RTHDCPL.EXE"
O4 - HKLM\..\Run: [Alcmtr] "ALCMTR.EXE"
O4 - HKLM\..\Run: [nwiz] "nwiz.exe " /installquiet /keeploaded /nodetect
O4 - HKLM\..\Run: [HPHUPD08] "c:\Program Files\HP\Digital Imaging\{33D6CC28-9F75-4d1b-A11D-98895B3A3729}\hphupd08.exe"
O4 - HKLM\..\Run: [KBD] "C:\HP\KBD\KBD.EXE"
O4 - HKLM\..\Run: [Recguard] "C:\WINDOWS\SMINST\RECGUARD.EXE"
O4 - HKLM\..\Run: [ccApp] "c:\Program Files\Fichiers communs\Symantec Shared\ccApp.exe"
O4 - HKLM\..\Run: [PS2] "C:\WINDOWS\system32\ps2.exe"
O4 - HKLM\..\Run: [HP Software Update] "C:\Program Files\HP\HP Software Update\HPwuSchd2.exe"
O4 - HKLM\..\Run: [Symantec NetDriver Monitor] "C:\PROGRA~1\SYMNET~1\SNDMon.exe " /Consumer
O4 - HKLM\..\Run: [Windows Defender] "C:\Program Files\Windows Defender\MSASCui.exe" -hide
O4 - HKLM\..\Run: [NvMediaCenter] "RunDLL32.exe " NvMCTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [PivotSoftware] "C:\Program Files\WinPortrait\wpctrl.exe"
O4 - HKLM\..\Run: [avast!] "C:\PROGRA~1\ALWILS~1\Avast4\ashDisp.exe"
O4 - HKLM\..\Run: [PowerStrip] "c:\program files\powerstrip\pstrip.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKCU\..\Run: [msnmsgr] "C:\Program Files\MSN Messenger\msnmsgr.exe" /background
O8 - Extra context menu item: &Traduire à partir de l'anglais - res://c:\program files\google\GoogleToolbar2.dll/cmwordtrans.html
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://C:\PROGRA~1\MICROS~3\Office10\EXCEL.EXE/3000
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: Recherche &Google - res://c:\program files\google\GoogleToolbar2.dll/cmsearch.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: Aide à la connexion - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra 'Tools' menuitem: Aide à la connexion - {E2D4D26B-0180-43a4-B05F-462D6D54C789} - C:\WINDOWS\PCHEALTH\HELPCTR\Vendors\CN=Hewlett-Packard,L=Cupertino,S=Ca,C=US\IEButton\support.htm
O9 - Extra button: Messager Wanadoo - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\PROGRA~1\WANADO~1\Wanadoo Messager.exe
O9 - Extra 'Tools' menuitem: Messager Wanadoo - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\PROGRA~1\WANADO~1\Wanadoo Messager.exe
O9 - Extra button: Wanadoo - {1462651F-F4BA-4C76-A001-C4284D0FE16E} - http://www.wanadoo.fr (file missing) (HKCU)
O16 - DPF: {0EB0E74A-2A76-4AB3-A7FB-9BD8C29F7F75} (CKAVWebScan Object) - http://www.kaspersky.com/kos/engli [...] nicode.cab
O16 - DPF: {17492023-C23A-453E-A040-C7C580BBF700} (Windows Genuine Advantage Validation Tool) - http://go.microsoft.com/fwlink/?linkid=39204
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - "C:\PROGRA~1\MSNMES~1\msgrapp.dll" (file missing)
O23 - Service: Asset Management Daemon - Unknown owner - C:\Program Files\Portrait Displays\forteManager\dtsslsrv.exe
O23 - Service: avast! iAVS4 Control Service (aswUpdSv) - Unknown owner - C:\Program Files\Alwil Software\Avast4\aswUpdSv.exe
O23 - Service: Autodesk Licensing Service - Autodesk - C:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: avast! Antivirus - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashServ.exe
O23 - Service: avast! Mail Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe" /service (file missing)
O23 - Service: avast! Web Scanner - Unknown owner - C:\Program Files\Alwil Software\Avast4\ashWebSv.exe" /service (file missing)
O23 - Service: Symantec Event Manager (ccEvtMgr) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\ccEvtMgr.exe
O23 - Service: Symantec Password Validation (ccPwdSvc) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\ccPwdSvc.exe
O23 - Service: Symantec Settings Manager (ccSetMgr) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\ccSetMgr.exe
O23 - Service: Portrait Displays Display Tune Service (DTSRVC) - Unknown owner - C:\Program Files\Portrait Displays\forteManager\DTSRVC.exe
O23 - Service: ewido security suite control - ewido networks - C:\Program Files\ewido anti-malware\ewidoctrl.exe
O23 - Service: Faciloservice - Everydev - C:\Program Files\Everydev\Facilosave 2006\Faciloservice.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: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Symantec Network Drivers Service (SNDSrvc) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\SNDSrvc.exe
O23 - Service: Symantec SPBBCSvc (SPBBCSvc) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\SPBBC\SPBBCSvc.exe
O23 - Service: SymWMI Service (SymWSC) - Symantec Corporation - c:\Program Files\Fichiers communs\Symantec Shared\Security Center\SymWSC.exe