I can`t play games normally with directx 11

Recently I installed the game Assassins Creed 3. It updated my directx 9 to directx 11. I played the game perfectly,no problems at all. Later I decided to play Assassins Creed 2. It requires directx 9 but I read that I can play the games that require directx 9 with directx 11. When I loaded the game it was so slow, both sound and video crashes like all the time. I don`t what the problem is. Can you help me?
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  1. My computer`s requirements:

    ACER Aspire 5742G
    Intel(R) core i3 CPU M380 2.53 GHz
    4 GB Ram
    NVIDIA GeForce GT 630M
  2. OS?
    if is windows XP then you have installed a false DX, because does not exist DX10+ for windows XP, only DX9.

    'but i played dx10 games on windows xp...' DX 9.0C or 9.0L (for systems with Windows Vista+ with no DX10 support) also run DX10 games

    'But i downloaded an DX10/11 pack for windows XP...' No you downloaded the complete DX9 with all redist files

    'but it says DX10/11 on DXDIAG.exe...' its only an string you can change it for what do you want, if you know how to do

    but as i say first how Operating System are you using?
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