And guess what that's what I've done in the past I have installed my OEM version, several times on different computers and many times all I had to do was ring up Microsoft and have to speak to an automated voice, all they do is ask for a string of generated serial numbers and once you have entered them on your phone keypad, they will generate a new serial number and hand it over the phone to u. Thats as simple as it is. Or you could use key grabber/finder to rip the serial key from another working machine. Fuck Microsoft licenses, they really annoy me.
And I am cheap so I always look for cheap solutions.