Problem

I used the sample from the following article to learn the custom PowerShell Snap In

http://msdn.microsoft.com/en-us/magazine/cc163293.aspx

I kept getting issue that the snap in was not registered.

Solution

The reason was I was not using the FrameWork64 directory InstallUtil.exe

C:\Windows\Microsoft.NET\Framework64\v4.0.30319

I found the solution from the following link.

http://stackoverflow.com/questions/558577/c-sharp-powershell-snapin-not-registering-using-installutil