I believed its in the bios under advanced settings or something. I might be wrong, but i think it is the same place you adjust your cpu freq, ram settings and agp fast write.
BF1942DC is the only game I have installed on my computer after wiping my drive three weeks ago. But it did not happen last year. As i said it only began after my yearly wipe, the first one on this machine. It happens some times outside games, like when i have ie open and musicmatch or just aim.
I just want to figure this out before HL2 comes out.