Medal of Honor problems

The game is all choppy, I got a new graphics card and
installed it but with no success. Computer is definetly
fast enough to support the game. I have also changed
every setting there is as well as uninstall and reinstall
the game. The game jumps around and i can't play it like
that...any suggestions on a fix. I was told to check and
see where my memory was being distributed to...how do I
do that. Thanks