Are you trying to activate a Microsoft Windows operative system and getting one of these errors?

Step 1. Open an elevated command prompt. To do this, use one of the following method. (Win+R, then type cmd)


Step 2. At the command prompt, type the following command, and then press Enter:

slmgr -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

Step 3. Type slui.exe 4 to access the phone activation screen and follow the steps to activate over the phone.

Source: https://goo.gl/HLLd56