Note: Before fixing telling you how to fix this, it is highly recommended to buy Genuine windows products. Probably the easiest, the Command Prompt method should be the first thing to do to check your key. Download, install and run vLite to see the mail window. You must enter a valid 25 character key in order to activate your copy of Windows. Once open, type slmgr -rearm in the CMD window. At the command prompt, type the following command and press Enter.

How to Find Windows 7 Product Key in Registry.

When the install screen appeared, I chose Custom Install and proceeded to wipe the hard drive, reformat it and reinstall Windows 7 from scratch. Navigate to Update & Security > Activation. You can try command prompt for Windows 7 boot repair above and see if it works. Then press the Enter key to send the command.

Doing this open the Windows command prompt with administrative rights. How to fix product key windows 7 how to fix product key windows 7 Even the commandline that you are running on Windows 8.

Microsoft office product key activation