Visual Studio 2012 Installation Hangs

Note: You might be wondering why this is about VS 2012 and not 2013. It turns out that I had to install 2012 for a gig that required it, then I ran into this problem.

Symptom:

You started to install Visual Studio 2012 (Pro in my situation). You have tried the Web install as well as the DVD install and it launches the installer, but shortly after there is no window and installation is hang up no matter how long you wait.

Fix:

Uninstall .NET Framework 3.5.1 (or possibly any other ones) before proceeding to start the installer. Your .NET Framework is likely corrupted in the manner that VS 2012 would not work.