Computer Freezes With Loud Buzzing Loop From Speakers

when i watch a Internet video, every so often, my computer completely freezes,and a wierd buzzing, repeated loop of the last miliseconds of audio play,and it's really bothering me, because no matter what i do, i can't seem to fix the problem!this problem only occurs on Internet though, and maybe everyother day once or twice when i'm on facebook.is there any suggestion or anything i could possibly do to help fix this problem.? i'm not sure what else there is to do. [code] the freezing only lasts like a 1-5 minutes though.