In one of my install packages, I am using the %IsUserNTAdmin% variable to check that the user has Administrator privileges before I do any registry manipulation/file copies/etc. The problem is that the machine in question is on a Win2000 domain. The user running the install has both Local and Domain Administrator privileges but the test on IsUserNTAdmin comes back "FALSE". Initial investigation looks like the test is using the un-qualified username (e.g. "myuser" instead of "domain\myuser"). Does the IsUserNTAdmin test work in this case? If not, I'll have to check in other ways.