Won't accept Registration Code

[Ernie]

I recently reformatted my hard drive, and went from Win98SE to Win XP Pro. I downloaded Microstudio. After I typed in the information and sent it in to activate Microstudio, it came back saying... Our records show that your registration code was already registered with a different computer. There is no different computer, just a different operating system. What do I need to do? I haven't tried Kpro or Vogone, but I'm guessing it will do the same thing.

Thank you,
Ernie