Error Message: STOP 0x000000EA THREAD_STUCK_IN_DEVICE_DRIVER (Q293078)

I received that after the last few black screens. The problem is not localised to CoD 4, but BF2.

I also received a message notifying me of low mobo battery a while ago, but this message now complicates things. Is it a low battery? Or a faulty driver?

Pentium 4 3.2GHz
2 gigs RAM
Nvidia 8800GT (possibly a PSU that doesn't supply enough power?)