with administrator privileges

Why this dont work:

tell application "Finder" to move tempfile to trash user name "namehere" password "pinhere" with administrator privileges --this file requires admin rights to move it

This works:

do shell script "killall appname" user name "namehere" password "pinhere" with administrator privileges

The documentation only lists “with administrator privileges” as being a parameter for “do shell script”. If you are interested in the hows and whys of this:

Short version: AppleScript has no wiring to elevate the privileges of a running process, nor does it have the ability to launch a process with superuser privileges outside of invoking privileged shell commands.

Long version: http://developer.apple.com/documentation/Security/Conceptual/authorization_concepts/index.html

administrator privileges is a parameter of do shell script, not of the move command