That may be what my other friend said as well, except in this case, the sound goes from:

"Doo-daa-dee-dum-dee-la-ma-mee"

then freezes, it just goes

"me-me-me-me-me-me-me" like a broken record.

My video card couldn't be possibly overheating, it never done this to me before, and even froze on simple programs. Another thing is, Quake 3 Arena should've been affected but surprisingly isn't.
Fullscreen on emulator programs doesn't seem to be a problem.. (zsnes sometimes is.)
Also, it plays SOME older 3D games perfectly, while heavy-loading 3D games, and games like CHICKEN INVADERS freeze up on loading.

I cannot afford to spend any money on any upgrades at this time.

EDIT: I've also tried this with my other sound card and got the same result.