unable to register

I purchased Morpheus about 2004. When I recently re-formatted my hard drive, it won't take the activation key. I have several keys due to upgrades and none work. I cannot find a place to change my old e-mail address that I used when I purchased. I am stumped. :?:
I just noticed the address at the top of this page...DUH
I just noticed the address at the top of this page...DUH