I'm having this exact same problem, but I am having NO high temps....

Intel E6600 @ 3.4GHz (never gets above 45C, is usually around 30C when it freezes)
G.Skill HZ ram
Sound Blaster Audigy 2
Nvidia 8800GTX

I also get the sound distortion, mainly when I'm in Crysis
videos also make me crash alot it seems....but other times it will just lock up randomly, i have NO clue what is causing it