Really Random Freezing issues

I built a computer a few months ago using the following parts:

Core i5 750 (overclocked to 3.2ghz)
MSI P55M-GD45 mobo
G-Skill 4GB DDR3 1333 ram
WD 640GB Blue HD
600W Zalman PSU
Windows 7 32-bit

When i first put this PC together, I was using my old 9800gt graphics card before upgrading to the GTX460 about 2 months ago.

The problem I'm having is that my computer will freeze randomly about once a week or even less. When it freezes, the sound that's playing will be a constant droning noise. At first, i thought it just froze randomly, but then i noticed it seems to freeze when I play videos, either on VLC or watching Youtube or anything online. Even when switching from the 9800gt to gtx460, the problem seems to persist.

This isn't a problem I can duplicate consistently. I've been able to sit through hours of video with no freezing and I've run Prime95 for over 3 hours with no problems. What could be causing this problem?
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More about really random freezing issues
  1. make sure none of the PCI-3 baseclock is overclocked, not all video cards will tolerate it...

    I'd also see what voltage is recommended for your RAM by manufacturer....
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