VS2012 / Windows Phone emulator can't start

I can't start the Windows Phone emulator in VS2012 ... I have downloaded the Windows Phone 8 SDK.

It launches, but gives me an error whilte booting:

"The Windows Phone Emulator wasn't able to ensure the virtual machine was running" ... blalbla ... "... Element not found (0x80070490)

and something about not being able to find a useable certificate?!

Any ideas on how to get it up and running?

Obviously this was caused by a permission issue.

My user account hadn't any permissions to the folder: "C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys". Giving my user account full access rights to this folder, seems to have solved the problem!