PC auto restarts when launching game

[Microsoft Windows]

Hi, my PC has been auto restart starting from yesterday whenever I launch games, and also randomly during browsing the internet but rarely, below are the two dump files that generated from crashing just recently. Your help would be appreciated.https://www.mediafire.com/file/xrynzz4061hl2uh/121124-6265-01.dmp/filehttps://www.mediafire.com/file/oqhocv0ocxwb1k6/121124-6515-01.dmp/filehttps://www.mediafire.com/file/0720by4u6n5il6v/120924-13015-01.dmp/file

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