At times, Norton product stops responding or even working all of a sudden. Be it Norton internet security, antivirus or Norton 360, it happens with the users of this software generally. But you must check that the Norton com setup with product key 1-877-226-6053 support is correct as per the requirement. Otherwise any unavoidable trouble might also occur. You should also review that the key is same as you received it, any changes will lead to glitches. Remember that the key is of 25 characters.