In Norton antivirus you will get the on access scan feature. This feature is a type of antivirus program which runs on a background and scan your computer on a constantly basis and secure your computer against viruses, spyware and other malicious malware. A lot of Norton users have reported that they are facing issue with Norton Security Setup With Product Key and users are not able to fix it. If you are also facing the same issue with your Norton antivirus then feel free to dial this toll free number which is 1-866-549-8444 for the best help and support.