Microsoft Office not available after Format

[gargalways]

I had to format my laptop , and re install the windows.
After reinstalling the windows got activated automatically but how to get Microsoft Office( Home and Student ) which i recieved with the laptop initially. 

Its is asking for the product key.

[WAWood]

@gargalways 

First off, the version of Office that comes preloaded on HP PCs is a trial version and you will not be able to get that back.

Second, if you believe that you purchased Office included with your HP PC, then you will have to contact HP Customer Support directly because we here can not assist you in that reinstallation.

To contact HP Support for laptops, see the following link: https://support.hp.com/us-en/contact/laptops