OK, go to Programs and Features, on the left side find the "Turn Windows features on or off" Locate "Hyper-V" and tick it (select it to be on). If only part of it turns on, you need to go into your BIOS and enable it in the BIOS, then follow the above steps again. Windows 8 will restart a few times but then when it starts up, you should have full use of REASON, works for me for Reason 4.01!
I found most of the answer here :- http://stunkit.com/blog/reason-on-windows-8/
Thanks to all that wrote replies!!!!