Which is better directx 9 or directx 11

i can't play games that installed in fullscreen and i can't even installed some games like pes 2010 and fifa 09 on my win 7. i want to know why and how i can solve it
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More about which directx directx
  1. Computer specifications please.
  2. DX11 is fully DX9 compatible and has a few extra bells and whistles.
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