problem with win7 64bit and crossfire(small window)

hello i just buy a new pc and before i ahve win7 32bit and crossfire is working fine in 800x600 in fullscreen..

now i have win7 64bit and i instaled crossfire and i put it on hig resolution and evry time i have windowed game. but in game i have option fullscreen game and thet is checked so it must be in full screen... i try all resolutions in game and in windows ... i put new drivers evrything i was try. can some one help me.

I have:
intel GMA x4500 graphic dx10 pixel shader 4.0 256mb
intel pentium dual core 2.7ghz 800mhz
ddr2 2gb 800mhz
80gb hdd

Call the admin of ur pc .