Windows 10: Can't activate Windows 7

I have been using a Windows 7 disk that was previously sold with a PC and have never been asked to activate it. However, I had to replace the motherboard 3-4 weeks ago and now Microsoft is asking me to activate the product. I don't have a product key that Microsoft is asking for. Any guidance would be appreciated.

:)

 

Windows 7 Club

How to Rearm and Extend Free Usage (Activation Grace Period) of Windows 7 to 120 Days

‘Rearm’ trick on Windows 7 is done using the similar commands and steps with Windows Vista. Follow these steps to reset and extend activation grace period from 30 days to 120 days in Windows 7:

Type any of the following commands into the command prompt, and then hit Enter:

Code: sysprep /generalize slmgr.vbs –rearm rundll32 slc.dll,SLReArmWindows slmgr /rearm[/quote] As rearm only works for 3 times, make sure the command is only been run when the 30 days countdown of evaluation period is almost expired.

source: mydigitallife.info

 

Activating Windows 7

I have a product key for my old Windows 7 and want to upgrade. I cannot find "activate windows now" as listed in step 1 on the instructions Product activation for Windows – online & support telephone numbers - Microsoft Support .

I need to activate this legit product. I used to long time without activating apparently.

Pamela

 

Windows 10 will not activate Error code 0x803F7001

thanks
I activated my Windows 10 from product key Windows 7