Redémarrage automatique - que faire ?

Bonjour, j'ai acheté un ordinateur récemment, en voici les spécifications :

Processeur : Athlon 64 dual core 4.2
Carte mère : amd 64 s939 PCX - ASUS a8n SLI SE nForce4
Geforce 7600 GS
1 GO de ram
300GB de DD
Windows XP

Mais malheureusement, et je ne sais pour quel raison, il ne cesse de redémarrer de temps en temps quand je le chauffe unpeu, je trouve ça drôle pour un dual core, au début quand je l'ai acheté, je pouvais jouer et décompresser des gros fichiers en même temps, et maintenant, une simple opération cause un redémarrage.

J'ai pensé que ca serait peut-être un virus, donc j'ai fait un scan HijackThis!

Logfile of HijackThis v1.99.1
Scan saved at 22:32:07, on 05/12/2006
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:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\LEXBCES.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\system32\LEXPPS.EXE
C:\WINDOWS\Explorer.EXE
C:\Program Files\Analog Devices\Core\smax4pnp.exe
C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
C:\Program Files\QuickTime\qttask.exe
C:\Program Files\F-Secure Anti-Virus\Common\FSM32.EXE
C:\WINDOWS\system32\ctfmon.exe
C:\WINDOWS\lclock.exe
C:\Program Files\MSN Messenger\MsnMsgr.Exe
C:\WINDOWS\system32\WTablet\TabUserW.exe
C:\Program Files\3dsmax7\VRLServer.exe
C:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
C:\Program Files\F-Secure Anti-Virus\Anti-Virus\fsgk32st.exe
C:\Program Files\F-Secure Anti-Virus\Anti-Virus\FSGK32.EXE
C:\Program Files\F-Secure Anti-Virus\Common\FSMA32.EXE
C:\Program Files\F-Secure Anti-Virus\Common\FSMB32.EXE
C:\WINDOWS\system32\imapi.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\Tablet.exe
C:\Program Files\F-Secure Anti-Virus\Common\FCH32.EXE
C:\Program Files\F-Secure Anti-Virus\Common\FAMEH32.EXE
C:\Program Files\F-Secure Anti-Virus\Anti-Virus\fsqh.exe
C:\Program Files\F-Secure Anti-Virus\FSAUA\program\fsaua.exe
C:\Program Files\F-Secure Anti-Virus\Anti-Virus\fssm32.exe
C:\Program Files\F-Secure Anti-Virus\FWES\Program\fsdfwd.exe
C:\Program Files\F-Secure Anti-Virus\FSAUA\program\fsus.exe
C:\Program Files\F-Secure Anti-Virus\Anti-Virus\fsav32.exe
C:\Program Files\F-Secure Anti-Virus\FSGUI\fsguidll.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\F-Secure Anti-Virus\FSPC\fspc.exe
C:\WINDOWS\system32\mmc.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\system32\mmc.exe
C:\Documents and Settings\DxS\Bureau\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://www.google.fr/ie
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.google.fr
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.winlsd.org
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.google.fr/ie
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://www.google.fr/keyword/%s
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.winlsd.org/
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 7.0\ActiveX\AcroIEHelper.dll
O2 - BHO: IeCatch5 Class - {2F364306-AA45-47B5-9F9D-39A8B94E7EF7} - C:\PROGRA~1\FlashGet\jccatch.dll
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_06\bin\ssv.dll
O2 - BHO: gFlash Class - {F156768E-81EF-470C-9057-481BA8380DBA} - C:\PROGRA~1\FlashGet\getflash.dll
O3 - Toolbar: FlashGet Bar - {E0E899AB-F487-11D5-8D29-0050BA6940E3} - C:\PROGRA~1\FlashGet\fgiebar.dll
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [SoundMAXPnP] C:\Program Files\Analog Devices\Core\smax4pnp.exe
O4 - HKLM\..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
O4 - HKLM\..\Run: [SunJavaUpdateSched] C:\Program Files\Java\jre1.5.0_06\bin\jusched.exe
O4 - HKLM\..\Run: [QuickTime Task] "C:\Program Files\QuickTime\qttask.exe" -atboottime
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [System] C:\WINDOWS\system32\testtestt.exe
O4 - HKLM\..\Run: [F-Secure Manager] "C:\Program Files\F-Secure Anti-Virus\Common\FSM32.EXE" /splash
O4 - HKLM\..\Run: [F-Secure TNB] "C:\Program Files\F-Secure Anti-Virus\FSGUI\TNBUtil.exe" /CHECKALL /WAITFORSW
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [LClock] lclock.exe
O4 - HKCU\..\Run: [MsnMsgr] "C:\Program Files\MSN Messenger\MsnMsgr.Exe" /background
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Startup: VRLServer.lnk = C:\Program Files\3dsmax7\VRLServer.exe
O4 - Global Startup: Adobe Gamma Loader.lnk = C:\Program Files\Fichiers communs\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: TabUserW.exe.lnk = C:\WINDOWS\system32\WTablet\TabUserW.exe
O8 - Extra context menu item: Télécharger avec FlashGet - C:\Program Files\FlashGet\jc_link.htm
O8 - Extra context menu item: Télécharger tout avec FlashGet - C:\Program Files\FlashGet\jc_all.htm
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: Parental... - {200DB664-75B5-47c0-8B45-A44ACCF73C00} - C:\Program Files\F-Secure Anti-Virus\FSPC\fspcmsie.dll
O9 - Extra button: (no name) - {200DB664-75B5-47c0-8B45-A44ACCF73F01} - C:\Program Files\F-Secure Anti-Virus\FSPC\fspcmsie.dll
O9 - Extra 'Tools' menuitem: Parental... - {200DB664-75B5-47c0-8B45-A44ACCF73F01} - C:\Program Files\F-Secure Anti-Virus\FSPC\fspcmsie.dll
O9 - Extra button: FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRA~1\FlashGet\flashget.exe
O9 - Extra 'Tools' menuitem: &FlashGet - {D6E814A0-E0C5-11d4-8D29-0050BA6940E3} - C:\PROGRA~1\FlashGet\flashget.exe
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O10 - Unknown file in Winsock LSP: c:\program files\f-secure anti-virus\fsps\program\fslsp.dll
O16 - DPF: {00B71CFB-6864-4346-A978-C0A14556272C} (Checkers Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {14B87622-7E19-4EA8-93B3-97215F77A6BC} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {8E0D4DE5-3180-4024-A327-4DFAD1796A8D} (MessengerStatsClient Class) - http://messenger.zone.msn.com/bina [...] b31267.cab
O16 - DPF: {B8BE5E93-A60C-4D26-A2DC-220313175592} (ZoneIntro Class) - http://messenger.zone.msn.com/bina [...] b47946.cab
O17 - HKLM\System\CCS\Services\Tcpip\..\{EE828582-88E6-46F2-900C-82E60B2A7D3B}: NameServer = 130.244.127.161 130.244.127.169
O18 - Protocol: livecall - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSN Messenger\msgrapp.8.0.0812.00.dll
O18 - Protocol: msnim - {828030A1-22C1-4009-854F-8E305202313F} - C:\PROGRA~1\MSN Messenger\msgrapp.8.0.0812.00.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Fichiers communs\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: Autodesk Licensing Service - Unknown owner - C:\Program Files\Fichiers communs\Autodesk Shared\Service\AdskScSrv.exe
O23 - Service: FSGKHS (F-Secure Gatekeeper Handler Starter) - F-Secure Corporation - C:\Program Files\F-Secure Anti-Virus\Anti-Virus\fsgk32st.exe
O23 - Service: F-Secure Automatic Update Agent (FSAUA) - F-Secure Corporation - C:\Program Files\F-Secure Anti-Virus\FSAUA\program\fsaua.exe
O23 - Service: F-Secure Anti-Virus Firewall Daemon (FSDFWD) - F-Secure Corporation - C:\Program Files\F-Secure Anti-Virus\FWES\Program\fsdfwd.exe
O23 - Service: F-Secure Management Agent (FSMA) - F-Secure Corporation - C:\Program Files\F-Secure Anti-Virus\Common\FSMA32.EXE
O23 - Service: InstallDriver Table Manager (IDriverT) - Macrovision Corporation - C:\Program Files\Fichiers communs\InstallShield\Driver\11\Intel 32\IDriverT.exe
O23 - Service: LexBce Server (LexBceS) - Lexmark International, Inc. - C:\WINDOWS\system32\LEXBCES.EXE
O23 - Service: License Management Service ESD - Unknown owner - C:\Program Files\Fichiers communs\element5 Shared\Service\Licence Manager ESD.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: TabletService - Wacom Technology, Corp. - C:\WINDOWS\system32\Tablet.exe

Si quelqu'un se porte volontaire pour m'aider, je lui serait très reconnaissant ! J'ai beacoup de mal a décoder ces messages et savoir quoi faire...

Voila, merci d'avance !

D'accord, je vais voir, merci.