Windows 7 32 bit Full screen not working!

can someone help me please i cant play my games in full screen so i posted a reply
My card
AMD M880G with ATI Mobility Radeon HD 4200nm
ATI Display adapter (0x9712)
DAC:Interal DAC 400mhz
Screen:1366x768 60hz

Help ME!
P.S i tried 1024x768 still not working!

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