Windows 7 x64 freezes without bluescreen

My computer has been freezing a few times now and I have no idea why, I even waited for one hour and a blue screen didn't appear. Tought it was the browsers, cause it usually freezes when I'm on the google chrome, but I uninstalled it and it still freezes with IE. I have played some games but it didn't freeze, only with browsers opened, although it froze 2 times without the browser opened, no idea why. I used the SF Diagnostic tool to colect the info, if anymore info is needed just ask.

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