Hi,
  I had the same problem but when I went to  Add/Remove Programs and
clicked on .Net 2.0 Beta it said it was already removed would I like to
remove the item from the List.    

I clicked Yes and it went way from the Add/Revome programs list but I kept
repeatedly getting the 1304 error.

After a little searching I found that it was still installed, but with out any
more Add/Remove program listing   how do you remove it?

Here is how.

   search for    *.msi    files   under     %SystemRoot%\microsoft.NET
         %SystemRoot% on my system was c:\windows

   Click Right on the MSI  file and  select UNINSTALL.

I got a couple POP UP BOXES about Error messages not being available,    I
just clicked cancel and  the uninstalled completed properly.

You might have to uninstall the J++ redistributable package the same way,
but that is under the same directory structure.