I just verified your record and your Registration Cod is unique, not used by anyone else. It was ordered on Feb 2, 2004 by yourself.
May I assume you are tying to help your Father? If so, thank you!
However, you may need to remove any prior version of Microstudio that is already installed before trying to install your new verson with you new Registration Code. If you follow the instructions
at this page you should be able to install. I find no reason to prevent your installing.
Let us know what you find.