Pc s'éteint après le démarrage 1 fois sur 2

Bonjour,
Depuis quelque jours, mon pc se fige après le démarrage : Le pc démarre puis je bouge la souris, 2sec plus tard l'écran se fige et le pc s'éteint. Je rallume le pc, et c'est marqué que windows ne s'est pas éteint correctement, on peut alors accéder au mode sans échec ou démarrer normalement. J'ai essayer Whocrashed et voici le rapport:

System Information (local)
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computer name: DAYZLUN-PC
windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
Hardware: Gigabyte Technology Co., Ltd., Z77-D3H
CPU: Genuine Intel Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz Intel586, level: 6
4 logical processors, active mask: 15
RAM: 8550043648 total
VM: 2147352576, free: 1908486144




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Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

On Sat 05/07/2014 16:06:27 GMT your computer crashed
crash dump file: C:\Windows\Minidump\070514-35895-01.dmp
This was probably caused by the following module: ks.sys (ks+0x1F2CE)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF8800F01F2CE, 0xFFFFF880096C5B80, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\Windows\system32\drivers\ks.sys
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: Kernel CSA Library
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time.




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Conclusion
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One crash dump has been found and analyzed. No offending third party drivers have been found. Connsider using WhoCrashed Professional which offers more detailed analysis using symbol resolution. Also configuring your system to produce a full memory dump may help you.


Read the topic general suggestions for troubleshooting system crashes for more information.

Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.