* Open the Terminal
* If the files are locked you will need to unlock them first. Type the following "sudo chflags -R nouchg ", then drag the file or folder onto the Terminal window to complete the path:
sudo chflags -R nouchg /Applications
note: make sure to type the space after the command, and before you drag the file onto the window.
* To erase the file/folder do something similar. Type "sudo rm -R " then drag the file or folder onto the Terminal window:
sudo rm -R /Applications
Be careful with deleting a folder. This will delete all files and sub-folders within it!