I would say that if it is not showing up under Add/Remove programs, then something is not correct. What I would do is reinstall the software to the same location that you had it installed and see what that does.
If you do the following you can figure out what version of DirectX you have.
1. Click the Start Menu and the Run command
2. Type in DXDIAG and click the OK Button
3. This will open the DirectX DIAGnostic program that will gather and show your computer data
4. On the System page (Opening page) look at the bottom of teh information given. There should be a line that shows
DirectX Version: DirectX 8.0 (4.08.00.0400) if DirectX 8.0 is installed.
5. If this is not what shows then you can download a free upgrade from Microsoft at:
http://www.microsoft.com/downloads/...ReleaseID=27741