Certainly, but as I do not currently have TRS2004 installed on this computer of mine, I may not be exact in the location of the file.
1.Browse to C:/Program Files/Auran/TRS2004/Bin.
2.Somewhere in there is Trainzhelper.exe. Right-click it and choose Properties.
3.Click Compatibility.
4.Click in the box marked 'Run this program as an administrator'
5.Click OK - if you are asked to confirm, click Continue, then Yes.
If you are having trouble installing .cdp files, repeat the process for ContentDispatcher.exe.
Also, you will need to do steps 2-5 for the Trainz shortcut on the desktop if you haven't already.
Shane