My new 4870 1gb card killed Frontlines Fuel of war

This is nuts. I recently upgraded to a ATI 4870 1gb card from a 8800 GTS 640 mb card. Everything is great, I game at 1920 x 1200 all settings maxed as I did with my old card until newer games had some trouble keeping up. I play Cod 4, World in Conflict, Far Cry 2, Crysis Warhead and newer Demos like Left 4 dead all work perfect. But after I installed the new card and new drivers and removing everything I had nvidia related to my old card. Frontlines fuel of war keeps giving me "Frontlines has encountered a problem and needs to close" I have installed and reinstalled all the correct patches at least 5 times now. I even disabled services under msconfig like the kaos website says to do but it still does the same thing. Is Frontlines in love with Nvidia cards or what? The funny thing is the game did work for a couple days after reinstalling the first time but days later this happens again. The only thing I havent tried is installing a older ATI driver but not sure this would fix the issue, im thinking its a patch issue somewhere. Does anyone else have a problem with this game and have a newer ATI card? This was one of my fav games and now cant fix this issue and at a loss. Thanks for any input..

I did driver sweeper, and everything else,apps and every game works flawlessly. Only Frontlines no longer works, very strange!

give driver cleaner pro a try. thats what i used when i switched from an 8600gt to a 3870 and it fixed my problems. i had similar issues as you, games ran really slowly. what i did was ran driver cleaner pro, reinstalled the game with the new graphics card in there, installed the new drivers, and everything was right as rain
give that a try and reply if it helps any