...
- Open System Preferences
- Select Accounts from the View menu
- If it's locked, click on the lock icon in the lower-left and authenticate as requested.
- Select the problematic account from the list on the left.
- Uncheck "Allow user to administer this computer"
- Recheck "Allow user to administer this computer"
- Logout and Login from the Finder to have the changes take effect.
- Proceed to remove to edit the printer list.
Reference: [ http://support.apple.com/kb/TS2754]