Note on Windows 7 and Handy Estimator 5. If you want to run Handy Estimator 5 on Windows 7, then you should buy the Professional Version or Ultimate or Enterprise because these versions allow your to run in an Window XP mode. You can read how to add this to your computer so you can still use your XP program. Go to http://windows.microsoft.com/en-US/windows7/install- and-use-Windows-XP-Mode-in-Windows-7 to find out how to do it or you can find a video on You Tube.