HELP PLZ T_T again with the full screen error

so i searched for like 3 hours trying to know how to get crossfire into full screen on win7 64bit, but nothing came up.
i got ATI Radeon HD 4350, 512 mb as my video card, and i just really need help with it.

even if i tick full screen on crossfire, it stays at my upper left corner, and it never goes full screen

sooooo, help pl0x?

btw my computer is
win7 64bit
AMD Phenom II X4 820 Quad Processor
6 GB ram
640 HDD
AIT Radeom HD 4350, 512mb vid card

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