title: Downgrade DirectX 11 to 9.0c (Win7)
body: <p>My Windows7 has DirectX 11 as default.<br>
  But I have trouble with DirectX 11 when I use SDL2.0<br>
  The solution is downgrading DirectX 11 to 9.0c (googling result)</p>
  
  <p>Is there any method for downgrading?<br>
  I couldn't find DirectX 11 in 'program add/remove'<br>
  So I can't remove DirectX 11 in 'program add/remove'</p>