In order to help mitigate the number of times users see the UAC dialog, and isolate users from each other Microsoft should look to move in a new direction with windows 7.  Instead of defaulting to a system wide install process Microsoft should make the default install model for a program at a user level. Using the visualization model built into Vista this could be done with relative ease.

Today I whipped together a program that I think many will find useful. After I refine it a bit I will post it on this site.  Hint: It has to do with Vista and Aero