Video freezing/sound looping/computer rebooting during 3D games

I can play for a fixed amount of time, but after a while my screen freezes, sound loops and distorts, and sometimes i can alt tab out of this and save it, but usually it crashes and I have to reboot.

I uninstalled my sound card (audigy), and I'm currently running the onboard sound card (realtek). This seemed to fix the problem, but an hour later, the screen froze, sound stopped, and I saw the blue screen of death for the first time. It gave me a log file...... I'd really appreciate if someone helped me fix this problem because its been haunting me for months now, and everything I do to fix it won't help.

Log file is attached. By the way I've been playing World of Warcraft.

The computer has rebooted from a bugcheck. The bugcheck was: 0x1000007e (0xffffffffc0000005, 0xfffff97fff5dc252, 0xfffffadfe3af5950, 0xfffffadfe3af5360). A dump was saved in: C:\WINDOWS\Minidump\Mini103007-01.dmp.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.