Game slow and lag time when moving or aiming.
Very frustrating to have my gun going back and forth due to the lag time.

Running AMD Athlon processor

We need a lot more detail please, also read the sticky at the top.

ummm...it's slow to respond,movement,aimimg,etc.
like the shooter is drunk.

When i shoot the gun goes bang....bang....bang
instead of bangbangbang
I've tried changing compatbility to XP,but that didn't help.

running an AMD athlon processor, with vista???? does that work????? athlons are the old processors right?
please type out what processor, memory, graphic card, soundcard and drivers you use, maybe then we can help you.