Unable to reinstall

[Office XP students and teachers]

I just recently formated my hard drive that Office XP was
on. I reinstall Office XP on the same computer but it ask
me to activate. So I try to activate my product again but
it says something like product key already used. How am I
supposed to use Office XP if I am unable to register
again?

 

[Jerome T. Czeikus]

You call the 800 number listed in the info you got with the CD.