LAG problems, Sound Glitches

hi, ummm...it seems that when i bought this game (i was so excited) i thought it was gonna run smoothly, even if i had to put it on Low graphics and everything. The Specs even say that i could play it.

I dnt kno if its my computer, but the game lags sooo badly, its going about 3-5 FPS.

My CPU is a AMD Athlon(tm) 64 Processor 3200+, 2.01 GHz

I also have bout 1.75 RAM

And my Video Card is a NVIDIA GeForce 8500 GT

And if that wasnt enough.....sometimes the games sound itself would kinda lag to. I mean....u can hear it....but it kinda glitches over and over.

Please help, and THNX!!