This is for all users of Windows XP Pro, Windows XP Home, Windows 2000 Pro, Windows ME, Windows 98 Second Edition, and Windows 98. It includes all hotfixes, patches and updates as of October 2003.
It’s totally free (free cd + free shipping) so all windows users might as well take advantage of it. It’s not going to cost you anything so why not spend a minute or two to order it. More importantly when you get the cd, use it!