Thanks. I found the 12.04 restriction after asking here. They do say that earlier versions will work but with unspecified "restrictions". It seems best to just install VirtualBox also. Actually Hyper-V is free and runs on Win7 desktop and later. I'm interested because I use it for running other stuff in a virtual machine.
Next dumb question: How do I get an ISO of the latest version of PP? I installed from the original DVD two years ago and have just done updates so no recent DVD here.