Is it getting difficult for you to activate Norton antivirus product? Are you fed up of seeing the invalid norton security key code free message on the screen? When you do not have correct Norton antivirus key, you would not be able to complete the registration process for your product. Without the activation key, you cannot activate the antivirus, opening the door for online threats. In case, you have done the payment, and the activation key is not working, you should get in touch with Norton customer care to avail professional assistance.