Windows 10: How to fix Windows error "We can’t activate Windows on this device"

I can't activate my windows 10 so there is a annoying watermark and I can't customize anything. I can't find a digital license or product key because this computer was bought long time ago and this laptop is owned by my parents.

:)

 

Windows 10 will not activate Error code 0x803F7001

thanks
I activated my Windows 10 from product key Windows 7

 

Windows 10 will not activate Error code 0x803F7001

Possibly there can be the problem with Microsoft activation Server, so your Windows 10 is not activated. In this scenario, you need to wait and verify if it is the issue from Microsoft’s side. But if you are getting error code 0x803f7001, you can also try these steps:

1. Open Settings app. Then go to Update and security > Activation screen > Change product.
2. Type your Windows edition product key and click Next.
3. You’ll get We couldn’t activate Windows error message.
4. Retry steps 1-3 then type your 25-characters unique product key.
5. Wait for the process to complete, Windows 10 is activated.

Hope something helps this problem

 

HD 3850 AGP Code 43 Error on Windows 10 Anniversary Headache!!!

Here we go. http://answers.microsoft.com/en-us/...t/d78465fa-80c4-4695-b8e8-41f9fa6eb4f7?auth=1

Not actually an announcement, but more an indication that the latest build is one step beyond support.