Learn how to use SLMGR or Software Licensing Management Tool to Install, Uninstall, Activate, View, Extend Windows License.

Fix Error 0xC004C003, 0xC004C003, The activation server determined the specified product key is blocked, on Windows 11/10, by following this guide.

Method 1: Find Windows 10 Product Key Using Command Prompt Command Prompt (or CMD) is probably the easiest way to find the Windows 10 license key on your computer.

Method 1: Find Windows 11 Product Key using Command Prompt One of the simplest ways to find the Windows 11 product key is to use the ever-so-popular command prompt; let us have a look.