“Visual Studio 2012 has stopped working” when solution is opened

Question

When I open Visual Studio everything is fine, but when I open any solution, it comes up with an error:

Visual Studio 2012 for Windows Desktop has stop

Answer 1

Had this problem when trying to Debug an ASP.NET site.

Turns out my "Application Pool" (e.g. ASP.NET v4.0) had more than one "Maximum Worker Processes" and that was causing the problem.