I want to recover my old windows product key which was given to my laptop

[Chiranth]

Is there means that i can get back my window's license key for my laptop as my all backup and data was formtted due to virus. I had to buy new windows and than install it . Now is there any means to get back my old windows license.

[Lil_Boy_Blue]

Hi

KeyFinderInstaller may help....
https://www.magicaljellybean.com/keyfinder/

Doing research, and none of the methods are mine, I have some, simple single lines of code that will list the same value for your Windows 10 Product Key…
Two for Windows 10 and one for Linux.

W10 Using cmd.exe as an Administrator (copy and paste accordingly).

wmic path softwarelicensingservice get OA3xOriginalProductKey >> c:\ProdKey.txt

Creates a text file called ProdKey.txt on your C:\ area.

Next is a PowerShell command, as Administrator...
(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey

but it will run within W10 using cmd.exe as an Administrator.
powershell (Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey

Last, but not least....
Linux@Lubuntu:~$ sudo cat /sys/firmware/acpi/tables/MSDM | strings | tail -n 1

https://www.microsoft.com/en-us/software-download/windows10
https://www.microsoft.com/en-us/software-download/windows10ISO

[WAWood]

@Chiranth 

You were provide some good links by @Lil_Boy_Blue but if that keyfinder does not work (as it often does not with Win10 OEM systems), then try this one:  http://www.tenforums.com/software-apps/2577-showkey.html

Good Luck

[Chiranth]

This code tend to give product key which is active currently,but i want the one which i had before i had installed new windows with different product key.

[WAWood]

@Chiranth 

Sorry, but only one product key is saved at a time.  If you overwrote the old one with a newer one, that newer one is the only one you can retrieve now.  Since HP keeps no records of individual product keys associated with individual PCs, there is no way to get that information from HP.