Registration Issues (Lord of the Rings: Battle for Middle Earth)

[Spectrum]

Hello, friends and countrymen. I've got an annoying problem.

I'm trying to play LoTR: Battle for Middle Earth online with a friend, but I am unable to register. As it would turn out, this game is already registered - on the other computer. This wouldn't be an issue, except a)That computer is horribly slow and b)I can't log in, because I don't know my dad's password.

Basically, is there a simple way to unregister a program?

[Spectrum]

Or would uninstalling a game from one machine effectively clear out the registration? Or, perhaps, am I already too late?