I'm getting various BSODs and crashes

Hi, I'm getting various bsod constantly sometimes while playing warcraft 3 somethings watching videos sometimes playing browser based games.The following are the bsod's that i have got so far

BAD_POOL_HEADER
IRQL_NOT_LESS_OR_EQUAL
PFN_LIST_CORRUPT

My laptop is HP nc8430 i have cleaned its fan and everything but still i'm getting random bsods and random freezes, sometimes it freezes for no reason at allAttachment 235675

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