Can't upgrade from Windows 8.1 to Pro on Lenovo U310

I have a Lenovo U310 Touch that came from the store with Windows 8.1 on it. I need to install Hyper-V and that requires 8.1 Pro. I have a product key from my MSDN subscription for 8.1 Pro and attempted to use the "Add Features" program from the system screen to upgrade. It takes the code, validates it as ok, goes through some downloading and other stuff then reboots the system. When it...