You're still not explaining what kind of problem you have. You need to be more specific and clear. Most of us wouldn't understand what kind of problem you are having. I don't know why but i see way too many Ati users having problems with this game. Either Crysis doesn't like ATI hardware cuz it's intentionally for Nvidia or it's your drivers. After all we did get a Nvidia intro
Check AMD's website to ensure that you are running the most updated drivers for your operating system. Also, check in catalyst to make sure that catalyst AI is disabled as well. Aside from that, guess and check in catalyst's settings, or wait for a patch.