I was trying to watch a trailer from gamespot. And I got an error... And then I tried to view other videos from other sites and I kept getting this error.
To reinstall DirectX, place the CD in that has the DirectX that you wish to attempt to install and search that CD. Usually D: E: or Q: for Dxsetup. Once found, double-click and choose the option to reinstall. We do not recommend that you attempt to install a lower version of DirectX onto a higher version unless it is completely uninstalled.
To install DX, we have four options:
1) Install a newer update over an old.
2) Use system restore to bring back the system prior to when it was installed.
3) Use a dx uninstaller.
4) Modify the registry to make it "forget" what dx version is installed. I'd recommend the other alternatives first.