This is off topic of what you guys are talking about

...but...
I was wondering why my game is a bit laggy?
PC SPECS:
Nvidia 9800 gt
2.20 GHZ AMD Phenom 9550 Quad-Core Processor
6GB RAM
Windows Vista (x64) (could this be the problem)?
Now, I run on Medium settings pretty much on everything, no antialising, no nothing...But I still get lag. Anyone know what's up?