Norton Error code 8504, 5 is the error, which may sometime give you rough time while using this antivirus software. However, one should first know this error might make your system slow or make it freeze. To resolve it, you should execute these troubleshooting tips: • Run the Windows System File Checker. • Try restoring the recent system changes. • Get rid of junk files from your system that includes cache and cookies data too. • Update the system driver if the update is available. • Redo the installation of Norton antivirus again by uninstalling it then installing it back. If the error code persists then you must dial norton customer care number for availing the help from experts. The customer team will remove the issue entirely and will make sure you don’t face a similar problem again.