Ordinateur s'éteint et se rallume sans raison

Bonjour,

Mon ordinateur s'éteint et se rallume au moins 1 fois par heure sans raisons.
J'ai donc décocher redémarrer automatique lors d'une défaillance du système.

Voici l'événement dans le système :
[ResponseResult]
ResultCode=0
[Install Progress]
Confirm Realtek Driver
Check Operation System Version
OS Information [WINMAJOR Number] = 6
OS Information [WINMAJOR String] = 6.1
OS Information [SYSINFO.nWinMajor] = 6
OS Information [SYSINFO.nWinMinor] = 1
OS Information [IsWin2000] = 0
OS Information [IsWinXP] = 0
OS Information [IsWin2003] = 0
OS Information [IsVista] = 0
OS Information [IsWin2008] = 0
OS Information [IsWin7] = 1
OS Information [IsWin8] = 0
OS Information [IsWin8.1] = 0
OS Information [IsWin2008R2x64] = 0
OS Information [IsMCE] = 1
OS Information [IsServer] = 0
OS Information [Service Pack] = 1
OS Information [x64] = 1
Operation System was Windows x64
Rtlupd [GetRtlupdForPackage] = 1
Rtlupd version [D:\Sound\Realtek\HD\WIN7\Vista64\RtlUpd64.exe] = 2.9.0.7
Rtkupd version [\] =
Current use Rtlupd version [D:\Sound\Realtek\HD\WIN7\Vista64\RtlUpd64.exe] = 2.9.0.7
Default Path [WDMDir] = Vista64
Default Path [RtkAudioDir] = C:\Program Files (x86)\Realtek\Audio
Default Path [RtkAudioDir x64] = C:\Program Files\Realtek\Audio
Default Path [RtlTempDir] = C:\Program Files (x86)\Realtek\Audio\Drivers
Default Path [RtkHDADrvDir] = C:\Program Files (x86)\Realtek\Audio\Drivers\Vista64
Default Path [RtkHDMIDrvDir] = C:\Program Files (x86)\Realtek\Audio\Drivers\HDMI\XP2K
Default Path [RtlPFHDADir] = C:\Program Files\Realtek\Audio\HDA
Default Path [USBDrvDir] = D:\Sound\Realtek\HD\WIN7\USBAud
Default Path [RtkUSBDrvDir] = C:\Program Files (x86)\Realtek\Audio\USBAud\Driver
Default Path [RtkIntelHDASSTPath] = C:\Program Files (x86)\Realtek\Audio\Drivers\IntelHDASST
Default Registry key [Installer Base Key] = SOFTWARE\Realtek\Audio\Installer
Current driver version = 6.0.1.7399 x64 Edition

Realtek HD Audio Driver Vista64 Directory Exist .
Status - OnMoveData
[Application]
Name=Realtek High Definition Audio Driver
Version=4.06
Company=Realtek Semiconductor Corp.
Lang=040c
Status - ProgramFiles_Installing
delete C:\Program Files (x86)\Realtek\Audio\Drivers\Vista64
Copy Realtek HD Audio Driver from Vista64 Directory
Run RtlUpd64.exe : C:\Program Files (x86)\Realtek\Audio\Drivers\RtlUpd64.exe --- > -s -cb -nrg2709 (TRUE)
Status - ProgramFiles_Installed
Copy .dat and .ini files
Install Realtek HD Audio Audio Driver
Run RtlUpd64.exe : C:\Program Files (x86)\Realtek\Audio\Drivers\RtlUpd64.exe --- > -u -s -fi -nrg2709 (TRUE)
-->Realtek HD Audio - SetupAPI result LAAW_PARAMETERS.nLaunchResult = -4
Special registry for hard-coding
Status - OnFirstUIAfter
Installer - OnEnd

Le problème ne serait-il pas le driver ???????