I've got:

Zen 6.5 sp1a
Win Xp sp2 WS

I have an application that auto installs flawlessly when logged in as
administrator to the WS. I changed the app to run as Secure System
User. I login as the user, and the app seems to install without
incident. I reboot the machine, and login as the user again, and
execute the installed application. It tells me this: Error reading
registry information. Ensure <application> is installed correctly. I
was under the impression that an app running as a Secure System User has
full rights to the registry and the file system. Apparently this is
not the case. Any ideas? Also, the users WS object has rights to the
install source.