Keep in mind that it's always best to use an official Windows product key for activation. Activation of Windows through Command Prompt and KMS servers is usually only intended for mass volume ...

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

PowerShell is an extended form of the Windows command prompt that you can use to customize windows from a window that looks like the DOS prompt.