problome With W7

what is your problem??? and i´ve got a question how can iget out of a clan??

umm, a couple things:
1) Do you have CF set to full screen in options? (I know this is an obvious thing to check for but sometimes people do forget these things.)
2) Is your monitor's resolution set to the same resolution as the one you have set in Cross Fire? (I think this is necessary for the "full screen" option to take effect.)