Hi!
I'm running FC2 on a PIII 733Mhz with a Powercolor graphic card (powered by an ATI 7500).
After a few (1-2) hours of use, it stops dead for no obvious reason (doing nothing CPU intensive, sometimes just reading a local html page with mozilla).
Do the freezes occur while you are working? Or when you pc is idle.
I used to have a problem when a 3d accelerated screensaver was running and my system went to display standby. It would completely lock up.
-- mvg, Steven