From CA Clarity 8.1 SP3 Product Architecture Stack (PAS)
Client Operating System
Microsoft Windows 2000 Professional: Service Pack 4
Microsoft Windows XP Professional: Service Pack 2 or higher
Microsoft Windows Vista, all editions
Client Applications
Microsoft Project 2000-2007, all editions
Java 5 Runtime Environment (required for Open Workbench, Clarity Microsoft Project interface, and XOG Client): 1.5.0_10 or higher patch level
Not supported does not mean not working.
Somewhere there was a post that to be W7 compatible the installation software has to know how to handle the UAC, which the components of 81.3 apparently did not.
Some user have installed MSP on W7 and don't have problems, though.
Martti K.