Veja uma possivel solução para o problema:
Open up a command prompt, and navigate to the \\Program Files\\Microsoft Visual Studio 8.0\\Common7\\IDE\\ folder (replace 8.0 with your version).
Enter the command \'devenv.exe /resetsettings\' (without the quotes). Hit enter, and Visual Studio will open. You should be able to successfully open the programs that previously displayed this error.
If this does not work, you can try to repair the installation by going to Control Panel, choose Add/Remove Programs, find Visual Studio and select repair.