Windows live messenger faire redémarrer mon o

Bonjour,
après plusieurs teste je peux vous ateser que lorsque je discute sur windows live messenger pendant environs 5min l'ordi ce coup et redémarre comme s'il y avais une coupure de courant or il n'y en a pas (l'ordi redémarre car j'ai mis ce paramètre à yes dans le bios).
Ma carte mère est une ASUS p5pSE et mon alim fais +de 500W.
Je suis en wifi pour internet et ma live box est a 5m de mon ordi au même étage.
J'ai coché l'option de Ccleaner pour qu'il nettoye l'ordi au démarrage de windows.

J'ai avg antivirus et zone alarm (free) en pare-feu.
Je fais de temps à autre un scan de spybots qui ne trouve rien.

Pourquoi et comment faire en sorte que l'ordi ne redémarre pas?

Voici un log de hijackthis :

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:25:42, on 21/02/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16608)
Boot mode: Normal

Running processes:
D:\WINDOWS\System32\smss.exe
D:\WINDOWS\system32\winlogon.exe
D:\WINDOWS\system32\services.exe
D:\WINDOWS\system32\savedump.exe
D:\WINDOWS\system32\lsass.exe
D:\WINDOWS\system32\Ati2evxx.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\System32\svchost.exe
D:\WINDOWS\system32\svchost.exe
D:\WINDOWS\system32\ZoneLabs\vsmon.exe
D:\WINDOWS\system32\Ati2evxx.exe
D:\WINDOWS\Explorer.EXE
D:\WINDOWS\system32\spoolsv.exe
D:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
D:\Program Files\Analog Devices\SoundMAX\Smax4.exe
D:\PROGRA~1\Grisoft\AVG7\avgcc.exe
D:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe
D:\Program Files\QuickTime\qttask.exe
D:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe
D:\Program Files\Java\jre1.6.0_03\bin\jusched.exe
D:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe
D:\WINDOWS\system32\ctfmon.exe
D:\Program Files\Google\GoogleToolbarNotifier\1.2.1128.5462\GoogleToolbarNotifier.exe
D:\Program Files\ATI Technologies\ATI.ACE\CLI.exe
D:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
D:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
D:\PROGRA~1\Grisoft\AVG7\avgemc.exe
D:\Program Files\802.11 Wireless LAN\802.11g Pen Size Wireless USB 2.0 Adapter HW.32 V1.10\SiSWLSvc.exe
D:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
d:\Program Files\Microsoft SQL Server\90\Shared\sqlwriter.exe
D:\PROGRA~1\INCRED~1\bin\IMApp.exe
D:\WINDOWS\system32\svchost.exe
D:\Program Files\Inventel\Gateway\wlancfg.exe
D:\WINDOWS\system32\wscntfy.exe
D:\WINDOWS\system32\wuauclt.exe
D:\Program Files\Internet Explorer\iexplore.exe
D:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WLLoginProxy.exe
D:\Program Files\WinRAR\WinRAR.exe
D:\DOCUME~1\PROPRI~1\LOCALS~1\Temp\Rar$EX00.781\HijackThis.exe

R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.google.fr/?gws_rd=ssl
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = https://www.msn.com/fr-fr/?ocid=iehp
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = https://www.bing.com/?toHttps=1&redig=5FC791212101479BAFBE1A679848B1AF
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = https://www.msn.com/fr-fr/?ocid=iehp
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Liens
O2 - BHO: Adobe PDF Reader Link Helper - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - D:\Program Files\Fichiers communs\Adobe\Acrobat\ActiveX\AcroIEHelper.dll
O2 - BHO: RealPlayer Download and Record Plugin for Internet Explorer - {3049C3E9-B461-4BC5-8870-4C09146192CA} - D:\Program Files\Real\RealPlayer\rpbrowserrecordplugin.dll
O2 - BHO: (no name) - {53707962-6F74-2D53-2644-206D7942484F} - D:\PROGRA~1\SPYBOT~1\SDHelper.dll
O2 - BHO: Groove GFS Browser Helper - {72853161-30C5-4D22-B7F9-0BBC1D38A37E} - D:\Program Files\Microsoft Office\Office12\GrooveShellExtensions.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - D:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O2 - BHO: Windows Live Sign-in Helper - {9030D464-4C02-4ABF-8ECC-5164760863C6} - D:\Program Files\Fichiers communs\Microsoft Shared\Windows Live\WindowsLiveLogin.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - d:\program files\google\googletoolbar1.dll
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - d:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [ATIPTA] D:\Program Files\ATI Technologies\ATI Control Panel\atiptaxx.exe
O4 - HKLM\..\Run: [ATICCC] "D:\Program Files\ATI Technologies\ATI.ACE\cli.exe" runtime
O4 - HKLM\..\Run: [SoundMAXPnP] D:\Program Files\Analog Devices\SoundMAX\SMax4PNP.exe
O4 - HKLM\..\Run: [SoundMAX] "D:\Program Files\Analog Devices\SoundMAX\Smax4.exe" /tray
O4 - HKLM\..\Run: [NeroFilterCheck] D:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [AVG7_CC] D:\PROGRA~1\Grisoft\AVG7\avgcc.exe /STARTUP
O4 - HKLM\..\Run: [ZoneAlarm Client] "D:\Program Files\Zone Labs\ZoneAlarm\zlclient.exe"
O4 - HKLM\..\Run: [QuickTime Task] "D:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [Adobe Reader Speed Launcher] "D:\Program Files\Adobe\Reader 8.0\Reader\Reader_sl.exe"
O4 - HKLM\..\Run: [SunJavaUpdateSched] "D:\Program Files\Java\jre1.6.0_03\bin\jusched.exe"
O4 - HKLM\..\Run: [TkBellExe] "D:\Program Files\Fichiers communs\Real\Update_OB\realsched.exe"  -osboot
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKCU\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [ccleaner] "D:\Program Files\CCleaner\ccleaner.exe" /AUTO
O4 - HKCU\..\Run: [IncrediMail] D:\Program Files\IncrediMail\bin\IncMail.exe /c
O4 - HKCU\..\Run: [swg] D:\Program Files\Google\GoogleToolbarNotifier\1.2.1128.5462\GoogleToolbarNotifier.exe
O4 - HKUS\S-1-5-19\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-19\..\Run: [AVG7_Run] D:\PROGRA~1\Grisoft\AVG7\avgw.exe /RUNONCE (User 'SERVICE LOCAL')
O4 - HKUS\S-1-5-20\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SERVICE RÉSEAU')
O4 - HKUS\S-1-5-18\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'SYSTEM')
O4 - HKUS\.DEFAULT\..\Run: [CTFMON.EXE] D:\WINDOWS\system32\CTFMON.EXE (User 'Default user')
O4 - Global Startup: Adobe Gamma Loader.lnk = ?
O4 - Global Startup: ATI CATALYST System Tray.lnk = D:\Program Files\ATI Technologies\ATI.ACE\CLI.exe
O8 - Extra context menu item: E&xporter vers Microsoft Excel - res://D:\PROGRA~1\MICROS~2\Office12\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - D:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Console Java (Sun) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - D:\Program Files\Java\jre1.6.0_03\bin\ssv.dll
O9 - Extra button: Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - D:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra 'Tools' menuitem: &Envoyer à OneNote - {2670000A-7350-4f3c-8081-5663EE0C6C49} - D:\PROGRA~1\MICROS~2\Office12\ONBttnIE.dll
O9 - Extra button: Run WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - D:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra 'Tools' menuitem: Launch WinHTTrack - {36ECAF82-3300-8F84-092E-AFF36D6C7040} - D:\Program Files\WinHTTrack\WinHTTrackIEBar.dll
O9 - Extra button: Research - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - D:\PROGRA~1\MICROS~2\Office12\REFIEBAR.DLL
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - D:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - D:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - D:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - D:\Program Files\Messenger\msmsgs.exe
O16 - DPF: {20A60F0D-9AFA-4515-A0FD-83BD84642501} (Checkers Class) - http://messenger.zone.msn.com/binary/msgrchkr.cab56986.cab
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://www.update.microsoft.com/...
O16 - DPF: {C3F79A2B-B9B4-4A66-B012-3EE46475B072} (MessengerStatsClient Class) - http://messenger.zone.msn.com/binary/MessengerStatsPAClient.cab56907.cab
O16 - DPF: {CC05BC12-2AA2-4AC7-AC81-0E40F83B1ADF} (Live365Player Class) - https://live365.com/
O16 - DPF: {D4323BF2-006A-4440-A2F5-27E3E7AB25F8} (Virtools WebPlayer Class) - http://3dlifeplayer.dl.3dvia.com/player/install/installer.exe
O18 - Protocol: grooveLocalGWS - {88FED34C-F0CA-4636-A375-3CB6248B04CD} - D:\Program Files\Microsoft Office\Office12\GrooveSystemServices.dll
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - D:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - D:\WINDOWS\system32\ati2sgag.exe
O23 - Service: AVG7 Alert Manager Server (Avg7Alrt) - GRISOFT, s.r.o. - D:\PROGRA~1\Grisoft\AVG7\avgamsvr.exe
O23 - Service: AVG7 Update Service (Avg7UpdSvc) - GRISOFT, s.r.o. - D:\PROGRA~1\Grisoft\AVG7\avgupsvc.exe
O23 - Service: AVG E-mail Scanner (AVGEMS) - GRISOFT, s.r.o. - D:\PROGRA~1\Grisoft\AVG7\avgemc.exe
O23 - Service: Google Updater Service (gusvc) - Google - D:\Program Files\Google\Common\Google Updater\GoogleUpdaterService.exe
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - D:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: Remote Packet Capture Protocol v.0 (experimental) (rpcapd) - CACE Technologies - D:\Program Files\WinPcap\rpcapd.exe
O23 - Service: SiS WirelessLan Service (SiSWLSvc) - Unknown owner - D:\Program Files\802.11 Wireless LAN\802.11g Pen Size Wireless USB 2.0 Adapter HW.32 V1.10\SiSWLSvc.exe
O23 - Service: SoundMAX Agent Service (SoundMAX Agent Service (default)) - Analog Devices, Inc. - D:\Program Files\Analog Devices\SoundMAX\SMAgent.exe
O23 - Service: TrueVector Internet Monitor (vsmon) - Zone Labs, LLC - D:\WINDOWS\system32\ZoneLabs\vsmon.exe
O23 - Service: Service de lancement de WlanCfg (Wlancfg) - Inventel - D:\Program Files\Inventel\Gateway\wlancfg.exe

--
End of file - 9640 bytes

Comment ça se fait?

Merci.