Bad pool header and system service exception BSOD help

My computer recently started BSoD with either bad pool header error or system service exception. i thought it might be faulty RAM and i wanted to upgrade to 8 gb any way so i up graded it and still gettin the error. Its becoming very annoying. it will always happen when i try to play World of Warcraft and sometimes when im just surfing the net. not really sure what the problem is i checked to make sure all my drivers were up to date and i have attached the mini dump file any guidence would be great.

Win 7 64bit
Asus M4A78LT-M LE mother board
AMD phenmon II 2.8 ghz processor
8gb of RAM
 
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