can no longer run nunit-gui after VS2008 install

On one machine I installed Visual Studio 2008, then installed NUnit 2.4.7, 
and was able to run the NUnit-Gui without a problem. On a second machine I 
first installed NUnit 2.4.7 without having Visual Studio installed, and 
NUnit-Gui ran without a problem. I just installed Visual Studio 2008 and now 
NUnit-Gui fails with this error:
"Windows cannot find 'nunit.exe'. Make sure you typed the name correctly, 
and then try again..."
The properties of the NUnit-Gui shortcut seem good to me: the command is
   "C:\Program Files\NUnit 2.4.7\bin\clr.bat" 2.0 start nunit.exe
and the start directory is "C:\Program Files\NUnit 2.4.7\bin\".
If I go to the NUnit bin directory and double-click on NUnitTests.nunit it 
runs the GUI fine and all tests pass. 

What piece am I missing to launch the GUI by itself?

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