I had the same problem, I wanted some users to be able to burn CD's using Nero.... but for using Nero you must have administrator's rights, and that means logging as an admin! I have found no other mean to burn CD's under a user account than to use another burning program.... I don't know if the "Power User" has network capabilities, and, more important, their entity....probably you could investigate this. As for reducing the "power" of Local administrators, you have no way. They're Admins, Full Stop.