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Since the Anti-Theft program goes into NOT RESPONDING mode, I guess you need check for the installed programs in the computer.
There may be some other security software (E.g.: Any other antivirus, antispyware, PC Security, Unlocker etc) in the computer
Try to delete the vault by booting up the computer in Safe Mode....
How to restart the computer in Safe Mode: Tap the F8 key continuously when you restart the computer and by using the up and down arrow key select Safe Mode (or) Safe Mode with Networking