Okay,log in to Cross Fire and go to Options,then do it Full Screen Mode.Save and ok,probably you changed it to Window Mode
Check the screen resolution.
Are you running Hyper Cam or some recording software?
Maybe is something on your resolution, check it out.
it has to do with win7 -.-
Right click on you'r destkop.
Go propoptions
Go to the tab resolution, and try other resolutions, till you crossfire come's full screen.
That's what happens when it is on Win7.
Change ingame resolution to "1024 x 678".If still doesn't work you need to change some options from the graphic card.I can't help you with Intel sorry.
Download Team Viewer I will try to fix it.