Lost Product Key for Microsoft Office Home and Student 2007

I have been using Microsoft Office Home and Student 2007 from quite a long time. I was thinking of installing it on other machine but i don't have the product key, i have lost it. I do have the installation disc. However, i don't have any record of buying the product.

Any help on this matter would be grateful. thanks in advance.

You can go through below article and check out if you are getting any help from there.

How to replace a lost or damaged Microsoft Office product key

Replace lost Office product keys

How to identify, locate, and replace a product key

If you have any doubt further then you can feel free to ask.