Titan Quest

Greetings

I have Titan Quest, and a brand new machine. I have Nvidia GeForce 7900 GS
and currently am using the microsoft driver. The game loads fine, but when
I move my character the screen freezes for a second or two then jumps. Very
annoyin, does anyone have any ideas about what I could do to help this
problem? I tried the newest driver from nvidia.com and that didnt help at
all..

Thanks
Troy