I have a weird problem with Fallout New Vegas. I can play it for 2 minutes or 4 hours, but the problem is that, when i enter any building or something new appears my PC freezes. And the weirdest thing when it freezes, my PC makes a rebooting sound, but nothing happens, sometimes after the sound i can walk in the game for about 5 secons and it freezes.
Everything else works great i get about 60 fps on ultra setting with Antialiasing and Anisotropic Filtering off, and it happens only in this game.
Nvidia GeForce 8800 GT
ADM Athlon 64 X2 Dual Core 5600+ 2.80 GHz
500 GB Hard disk space