HP India — genuine key of window

Address:

Chandigarh, Punjab, 160001

Dear sir,
I have got formatted my lap top which was purchased by me vide invoice no.697 dated 04 june 2014. Presently i was using window 10 pro. Please advice me how to use genuine key from my invoice. There are serial number and product number and some other codes mentioned on the invoice. Please advice.

Dv sharma
For neha sharma

Zirakpur-140603

Phone no.[protected]