>>I had the same problem a few months ago. If I remember right, I think what I finally ended up doing was running the setup on the WCU disk (same thing as the prerequisites disk) by itself first - selecting all the the prerequiestes in the list - then when it finished - ran the setup in the vs.net 2003 disk.
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>The only way to achieve this installation was to use the Visual Studio .NET 2003 PreRequisites from May 2005. Then, when prompted, I had to manually select the sub directory of the PreRequisites in order to make this work.

Did you run the prerequisties disk by itself first, or did you do the install as normal and just use the May 2005 disk instead?