Hi Leighroy and welcome to the forum!
You do seem to have reigstered here with a valid key, so it's weird that it won't work with the game itself.
If you want, you may send me the key in a Personal Message. I will have it checked for you by VSTEP.
But first you have to be sure that you entered it correctly of course. Did you rule out any chance of a mistake, like a zero being read as an "O", for example?
If you're certain you entered it correctly yet it wont accept it, send it to me, and we'll see what the deal is. We'll get it running, no worries.
Regards,
Fred