The version of clr.dll does not match the one mscordacwks.dll was built for

Question

I have a C# console app in Visual Studio 2010 that I can run just fine. When I attempt to run the process in debug mode, I am presented with the following error:

Answer 1

I have finally solved this!

It seemed to have happened after I updated my Windows 7. One of my files must have been out of date.

The fix: Install VS 2010 Service Pack 1

Worked correctly right after I installed. Hitting breakpoints and everything!

Hope this works for you too!