New product

Hello, I just bought the Norton Security with backup, when I try to put in the key the first letter of the first 5 letters is a ] and it will not let me enter a ].  When I try to enter the ] it leaves it blank and the next letter is now your start letter, which makes all of the other 5 letter combos off by one.  What can I do about the ].

Thanks for the help

Bill P