...
Bring up a VS 2008 console window. Run the setup file created above. Relative to the root directory of your source installation, it will have a path something more or less like
bin\WIndows-i386-32bit-vc90-Debug_setup.bat
...
studio\Windows-i386-vc90-Debug
Then typestart up VS on one of the solution files, e.g.
devenv allGleam.sln