When you try to uninstall Microsoft Visual Studio 2003 .NET, you get the error message from the installer:

Setup is unable to determine a valid ordering for the installation. See the error log for further details.

Enter the following command into a command line window or into the Run... input box:

msiexec /x {E05F0409-0E9A-48A1-AC04-E35E3033604A}