Jason,
Windows 7 has DirectX 11 if I'm not mistaken, therefore you wouldn't need to downgrade to version 9.0c that was pretty much an XP era version. I believe the version that came with your install is just fine. In fact, you can click your "Start" menu, go to Run, then type in Dxdiag and press okay and this will tell you what version of DirectX you are running. Let us know.
Thanks,
Mark