If Avast mail shield has blocked a threat then to get this issue fixed open a notepad on your system and in the note pad type the reset command then enter the command for deleting all the temporary files, then save that file on your desktop, then conduct a reboot on your system, after that run the file on your system and press “fix” once the process will be done a log will be produced which will show if the issue is fixed or not and For more help or support connect with the experts at Avast Helpline number & http://www.avast-phone-number.com/ & http://www.avast-phone-number.com/blog.html