I'm sorry to say, but that force reinstalling didn't work for me :/. BUT I have another solution

1)
http://www.softwarepatch.com/windows/directx.html download that file
2) put those files to whatever folder you want. I put them to c:\Directx
3) Then extract all of those zip/rar files to that same folder
4) Then select ALL of those .inf files, by ctrl clicking them all, then press right mouse button and press "install". Then it will install all of those files to your comp manually, so it WILL install them over the old files, without scanning if you have 9.0c already or not.
5) It asks you to reboot your comp, do that
6) Your 9.0c is now installed, enjoy your audiosurf
