Visual Studio Solution Unavailable (reload doesn't work)

Question

I am downloading a sample program for a barcode reader that I am using. Everytime I download the program and run it I am prompted with the error in my solution explorer (see ima

Answer 1

Happened to me when I attempted to load a solution that contained projects that were built with a newer version of Visual Studio 2010 and slightly newer .NET Framework. In other words even though both Visual Studios were 2010 SP1, the original had all of the most recent VS patches applied, where the one I was trying to open did not. Set Windows Update to make sure to check for updates for other Microsoft Products, and apply all Visual Studio patches and Framework updates making it current. Reopen.