I'm currently using k-lite's latest codec pack that includes the latest verson of BS player, everytime I open certain video files, my computer shuts completely off and restarts, I don't get an error or anything, it seems to be random videos that I download, but the same ones ALWAYS do it. Any idea what could be causing it?

Amdxp 3000 barton
abit nf7-s rev 2
1 gig corsair xms ddram
ATI 9700 Pro
Audigy 2 ZS