The master distribution center in Bend, Oregon, has 42 people, including nine Windows 2000 users, 22 people using Windows XP Professional, and 11 people using Windows Vista Business Edition. The distribution center is slated to upgrade its computers to Windows 7 Professional. What preliminary steps should be taken before starting the upgrades on these computers? In general, are there any problems involved in upgrading to Windows 7 from each of these operating systems?