Unable to play games in full screen

I have a 7770 card with a 27 led inch monitor. i5 3750k processor. 8gb memory. When I try and play games in fullscreen mode the quality drops to less than 1080p, with fps below 30. I have to play the game with the windows borders, my only resolution is in non fullscreen mode, where the taskbar is in view. Any help is appreciated. Have tried the alt/enter thing also.

Thanks ETC
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More about unable play games full screen
  1. You do have the onboard video disabled right?
  2. larrym said:
    You do have the onboard video disabled right?

    How do i do that?
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