As with previous versions of Windows you can use one license per computer only, regardless of the edition that you purchase. There is one exception and that is the Windows 7 Home Premium Upgrade Family Pack. There are a few things you should know though: the Windows 7 Home Premium Upgrade Family Pack is not available for download and is only available in certain locations.

The Windows 7 Home Premium Family Pack allows you to install Windows 7 on three computers in your household, providing that they are running genuine copies of Windows XP or Windows Vista; the pack costs approximately $149.00.