Windows Home 7: Premium Product Key

Technically, the key acts as a password to unlock the specific binaries of the Windows 7 Home Premium edition. Microsoft utilized a specific algorithm to generate these keys, encoding within them the specific version of Windows being licensed. This is why a "Home Premium" key could not unlock "Windows 7 Ultimate" or "Professional," even if the installation media contained the files for all versions.

Some "grey market" sites sell keys for a few dollars. Proceed with caution : these are often volume licenses (MAK) or MSDN keys that may be deactivated by Microsoft later. windows home 7 premium product key