MS Office problem

[elaich <a@xxx>]

I bought this computer from a kid across the way. Well, since he had 
completely bollixed up XP, I had to use the system recovery option to 
reinstall XP and get it working again.

When I go to MS Office, it wants the Product Key. Office was installed on 
the thing from the factory - I thought using the system recovery kept all 
registered programs in working order?

Of course, I don't have it, and have no way of getting it. Is it possibly 
still stored in the registry? If so, how would I find it?

BTW, it's a Compaq.