BSOD's while gaming or sometimes during bootup

Hello everyone, I'm kindly requesting a bit of assistance. Recently I've noticed while playing the game "Combat Arms", my computer receives random blue screens at some points, doesn't always happens but when it does I obviously wonder why. Usually the types are "System Service exception" or "Video memory manager".

Also noticed this evening while booting up the laptop blue screened and the type was "PFN list corrupt". I've uploaded my dmp files and attached them below. Hopefully someone can help me out. Thanks in advance.

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