I can play JK2 for a while, but then it either a) freezes cold, sound loop and all or b) just reboots the computer while I'm playing. Before you say anything, it's not overheating. I've also tried turning everything to the lowest setting, but the problem persists. I can usually play for 10-30 minutes before it freezes in SP; MP usually freezes within five minutes. Anyone have any ideas?

Specs:

PentiumII MMX @ 550mhz
196mb RAM
Radeon 7200
SB16 (that's right)