Today I have opened Visual Studio 2012 and I have clicked on "New Project" and magically have discovered that .... it freezes and does not show me the templates list!

The problem is typically due to the templates list which is "polluted" by all SDKs that we install. To solve it, I made sure that Visual Studio regenerate the templates cache, as follows:

1. Open "Developer Comand Prompt for Visual Studio 2012" with administrator rights (found under "Visual Studio Tools");
2. Run "devenv / setup";
3. Wait about 10 minutes for the process to be completed;

When you restart Visual Studio ... everything worked again!