Visual Studio 2012 csc.exe Error. Executable not valid for OS

Question

I am getting the following error when trying to compile and test any type of project in Visual Studio 2012 Professional.

Error 1 The specified task executable \

Answer 1

The problems associated with csc.exe in Visual Studio 2012 can mostly be solved by repairing Visual Studio.

You need to repair Visual Studio. Go to Control Panel -> Programs. Then select your version of Visual Studio you are using and press "Change"(or right click it and press "Change"). When the setup appears, click "Repair".