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Check your drivers, and the card itself - mine started doing this, then I noticed that the heatsink was rattling around the bottom of my case, causing it to overheat. Quick switch for an old Voodoo3 heatsink and some arctic silver/epoxy fixed it, but heat is you enemy when it comes to hardware - check the CPU temperature with something like MBM5 too, especially AMD processors, which are notorious for heating up at a moment's notice and bringing down your PC.
There's an infamous Tom's Hardware video of them removing the heatsink from an AthlonXP while it was running to test the thermal protection diode..it went to 371"C in 3 seconds, froze the PC, and destroyed the chip/motherboard - obviously, if your PC is still working then it wont be quite this extreme, but it can be a problem and cause of instability.
Final cause of frequent system freezing tends to be cheap components - poor quality fans, unbranded generic ram, an OEM power supply - or one that isn't powerful enough. What other devices (like internal IDE drives) that draw power from your PSU are you using, and what cpu/motherboard/power supply wattage??
Ha ha, change it too Pee Wee Herman or something less obvious maggot boy.