Too much anti-virus? Threatfire, PC Tools Spyware Doctor and McAfee…?

I have McAfee, Threatfire and PC Tools Spyware Doctor installed. I’m concerned that this is affecting the operation of my computer. I’d like to uninstall PC Tools Spyware Doctor – will this leave me vulnerable or is it already superfluous? M

It’s better to have only one antivirus system so as to prevent interference. I also had ThreatFire and another antivirus system and whenever I scanned using ThreatFire the other antivirus would interfere with it. So, it’s better to have only one antivirus system.

error doctor – errordoctor.com

Pc Tools Spyware Doctor/Antivirus 2011 – 1 User/3 Pc [Old Version] $13.99 SYMANTEC 21073016 PC TOOLS SPYWARE DOCTOR/AV 2011 1U/3PC…