Pop up "The operation cannot be completed because the item is locked."
If you have an Admin password, you should be able to delete the application as follows:
1) Open Terminal (in Utilities).
2) Copy and paste the following into the Terminal window, but
don't press return yet.
3) Type a space or two at the end of the line you just pasted into Terminal.
3) Drag the application icon you wish to delete into the Terminal window. This will append the application's path to the command you pasted in.
4) Click on the Terminal window to make it active, and press return. Supply an admin password when requested.