I have a similar problem...new computer...Windows XP...reinstalled all my software (QuickCAD Millennium Edition)...now I have to reinstall the program EVERY TIME I want to use the product by clicking on the desktop shortcut. After I reinstall, I can open and use CAD, but if I go on to something else, come back and click the shortcut, the program won't boot up. What a possible problem besides buy a newer version (I'm SO used to this one)?