Oh shit I'm going to get flamed here! But it could be so many things , heat issue , driver problem's you pick. If was me I 'd format and reinstall , you seem to have so many issues's, games , task manager. You say you went back to a restore point? Mabye an option, back up reinstall ?
link: http://www.google.ca/search?q=PC+fre...S:ohmy:fficial
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