An SiS 650 is a pretty new chipset. Keep in mind that the 650 actually is the motherboard Chipset, not jst the video.
You need to make sure that all the drivers for it are installed. This may mean an AGP bridge driver AND a VGA adapter driver.
Freezing could also be a sign of a problem in the hardware accelerator in the motherboard. This would not be anywhere near a first with SiS integrated chipsets.
It would really help if you could tell us the manufacturer and model of the motherboard.
Bat rays? We don't need no stinking bat rays!
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