I read something about having to cap the fps in farcry 2 to 50fps. Any suggestions?
Well you cannot "cap" any frame rate. Only if you turn on VSYnc, the frame rate gets limited to 60 (which is usually the refresh rate of the monitor). This is assuming your gfx card can pump out more than 60 frames.
Sorry but all I can say at this point is try farcry2 with the updated drivers.
A point to be noted, install the new drivers only after completely removing the older ones.