Hello. Oh, I forgot... Welcome to the fourms. It is not recommended to run more than one firewall or AV at a time. However, on-demand scanners like Spybot-SD, SAS, WD can run together. However, the real-time protection "types" of Resident Shields like Windows Defender, I would NOT recommend running more than one together. TeaTimer and WD's real-time can co-exist.