Windows 10: lost my account and want to get my product key

I had windows built in in my laptop when i bought it and after i formated it and lost that account and now im using linux . Where can i get the windows product key of the previous windows i had so that i can use it again ?

:)

 

Lost of Product Key

I bought my Laptop in July 2015 with the Home and Student Microsoft Word. When I refreshed my computer I lost the Product key and I could not find the CD that contain the product key. What shall I do please suggest and help.

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code:

 

I lost my product key

We know nothing about your computer, or how you lost your product key.

More information is required to assist you correctly.

I suggest that you read this for suggestions on how to ask a question in help forums:

"Suggestions for asking a question on help forums"

http://support.microsoft.com/kb/555375/en-us