Computer BSOD when playing games

Hi,

So for the past 5 months I've been experiencing Blue screens whenever playing games on high graphics and some on medium. Games like Age of Empires III, World Of Tanks and civ 5 can't be played on higher graphics where as before I could.

The computer stops the game sound , plays it for a bit, then freezes until a BSOD flashes and computer restarts. When it does it says it can't find a boot device.

Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.techaddfdxfvisor.co.uk/forum/helproom-1/computer-bsod-when-playing-games-4663410/
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