Windows 7 saves your changes to the media streaming options.
By default, most of the items in your Windows Media Player library are automatically assigned a rating from 1 (lowest) to 5 (highest) stars. These ratings are assigned by third-party providers and online stores. You can manually change the rating by right-clicking the item you would like to change in Windows Media Player, selecting Rate from the drop-down menu, and clicking the new rating you would like to assign (1 to 5 stars, or unrated).