PC Freezes Randomly (3 times a day)

I wasn't too sure about where to post this topic, I'm fairly sure this is about either memory or the mobo.

Anyway, my old PC keeps freezing, I've reinstalled windows 7 ultimate 64-bit so it's probably not software-related.
It's running 4 gigs of DDR3 1600mhz from kingtson (two sticks, each 2048mb)
I'm running memtest86+ as we speak.
Could it be bios-related? I doubt it... But what if my previous win 7 install was different, or older.. might it be a windows update that caused it?
Wait... I actually ran ubuntu linux 32-bit for a few days and I don't recall it freezing... hmmm, or maybe I'm wrong. I could install another linux distro and let it stay on for a few days and see what happens.

Anyway, what do you guys think? might it be the power supply? It's certainly big enough. 500 or 600 watts. I'm just running 1 3gbps sata hdd and a few fans. as well as my Q6600 quad core.

All help is highly appreciated, if someone has any idea as to what I can do to test it further. or find the issue, I won't need to spend my money on going to the computer store and letting them test-bench the whole thing.

Thanks! :D
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  1. It should be noted that, when it freezes, nothing happens. the image on the screen stays the same and all audio suddenly stops. no crackling, just stops.

    I know the GFX Card is fine because I've used it on my other PC for a long time.
  2. try to install win7 32 bit... hope it works...
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