DirectX 9.0c problems with file missing

I ran the dxdiag to check for my current version of DriectX. Clicking on
the DricectX Files tab I get the following:

System.dll file missing
You should reinstall DirectX to get the latest version

I scrolled down the file list to see where the problem was and here is what
I found:

System.dll <file missing>
System.dll 1.00.3705.6018
System.dll 1.01.4322.2032

I went to the Windows DirectX site and reinstalled the DirectX 9.0c it only
took a few minutes instead of the extimated 3 hours of downloading (I am on
dialup)

I saved this file to my desktop and clicked on it to install, accepted
agreement then the window came us saying "The components installed are now
ready for use" this window came up right away.

Went back to run dxdiag and I still get the same message. Not sure what to
do from here.

Thanks