To get Tversity to install/run on a Vista Ultimate installation that is joined to a domain, I had to disable “User Access Control.” I did it via the msconfig utility executed from a “Command Prompt.” Go to Tools/Disable UAC.

Note: If Vista is not joined to a domain, you can disable “User Access Control” via Control Panel/User Accounts/User Accounts.” From there, you can click “Turn User Account control on or off.”

You have to reboot after changing the setting.