Use the latest nVidia drivers. The choppiness will more than likely go away using them.
Also shut down any unnecessary programs from running in the back ground when you game.
The lag when online gaming can be caused by several things. I'm assuming you have broadband so try hooking up your PC directly to the Cable/DSL modem and see if the lag remains. If it cures the lag then you may want to look at the devices between your PC and the modem.
Good luck!
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