If your PC previously had an activated version of Windows 7, 8, or 10, it likely has a "Digital License" linked to the hardware. Reinstalling the same version should trigger automatic activation.
Familiarize yourself with the licensing terms and conditions. For personal use, the Home edition is usually sufficient, while businesses might require more advanced features found in Pro or Enterprise editions. If your PC previously had an activated version
: Microsoft can detect unauthorized changes or generic keys. If detected, your system may be deactivated, and you will receive frequent reminders to obtain a proper license. Legitimate Alternatives for Activation the Home edition is usually sufficient