If you can't allow the service this way, you can try the following:
You will need to allow PC Matic and SuperShield through the Windows Firewall:
https://supportfiles.pcpitstop.com/HelpDeskVisualAid/Windows/How_to_AllowPCMatic_thru_Firewall.pdf
Once that is complete, stop the SuperShield Realtime service and restart:
type in services.msc, and press Enter
look for "Security Center" in the list of services (PCPitstop Realtime)
turn it off, then wait until the shield turns red, then turn it back on
If that does not resolve the issue, please open a supp