To enable parental locking again, you will need to create a new PIN. Deleting Parental Locking settings will affect locked channels but not hidden channels since you don't need a PIN to hide channels.
Now all of your Parental Locking settings are disabled and your PIN has been erased. You will be returned to the last channel you were watching.
If you Lock Adult Programs, you will not be able to change your PIN or reset Parental Controls. If you want to reset Parental Controls, unlock Adult Programs.
For more information on using your Parental Controls, watch the Help On Demand videos on locking channels, locking shows by rating, locking On Demand rentals and hiding channels.