Try a newer version of the video card drivers too - have a look on
www.guru3d.com and get the latest Forceware drivers, there will normally be newer versions on here than on the nVidia website - sometimes you'll be able to get a more stable version by testing out some of these.
Do you get any graphic corruptions shortly before the PC freezes? little blocks on the screen or anything? This is normally a sign that the video card is struggling for stability, and you'll normally get a crash shortly after it. This usually only happens when playing games though, when the card is under more stress. If this happens, it could be that overclocking could have been turned on for the card, and it can't cope. Installing the newer drivers will normally turn this off by default.
Also check if the fans in the PC are able to spin freely, give them a blow. There may be one on the video card, check that one too - although it's probably a heatsink if it's a 5200.
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