https://youtu.be/OIvHQxtnWp4

Published on Mar 23, 2017

Fix Windows 10 Activation Failed Error Code 0x803F7001

I show you a quick workaround for this annoying error.

1. Click Start / Settings / Update & security / Activation / Change the product key then enter the new product key then click Next to Activate

Warning: please make sure you use the right product key for your windows edition or it won't work.

2. Enter the Windows 10 Default Product Key. Win 10 Home: YTMG3-N6DKC-DKB77-7M9GH-8HVX7 Win 10 Pro: VK7JG-NPHTM-C97JM-9MPGT-3V66T Win 10 Home N: 4CPRK-NM3K3-X6XXQ-RXX86-WXCHW Win 10 Home Single Language: BT79Q-G7N6G-PGBYW-4YWX6-6F4BT Win 10 Home Country Specific: 7B6NC-V3438-TRQG7-8TCCX-H6DDY Win 10 Professional N: 2B87N-8KFHP-DKV6R-Y2C8J-PKCKT
3. It will probably fail to activate but don't worry.

4. Click Start / Settings / Update & security / Activation / Change the product key then enter the new product key then click Next to Activate

5. Enter the Windows 7, Windows 8 or Windows 10 Product Key

You can get a lot more details from the link below.
How to troubleshoot Product Activation in Windows 10
https://goo.gl/zbjpKY