microsoft word 2000 reinstall

I just recently had to restore my pc..now I am trying to reinstall microsoft word, and it is asking for a 25-character product key that can be found on my certificate of authenticity.....I do not think I have it..they said it can be found on the cd case, but the cd came with the computer in a paper sleeve. I do not have that sleeve. What can I do to install this cd??

 

If the software originally came preinstalled on your PC there might be a sticker on the case somewhere with the registration code. (At least that's how I've seen Dell do it as well as some others.)

Failing that you may have to call Microsoft.