If you have a 64bit processor:
http://www.productquest.net/windows-...bit--nfr-.html

That's a damn good price on a full version.

And if it's a 32 bit:
http://www.productquest.net/windows-...-key-code.html

Those are both Pro versions and are student editions. (I don't know if you are a student but perhaps you were at some point or will be in the future... ex: Do you do bible study? LOL)