Used to be anti virus just scanned the hard drive looking for virii files living there on and zapping them. Now they have real time scanners, permanantly resident, running, and soaking up CPU time to the point that Trusty Desktop gets annoyingly sluggish. I got into the control panels of MalwareBytes and tried to turn off the real time scanner. Nothing much happened. So I used Windows Task Manager to kill the "mbam.exe" process and the machine got more lively. I ought to uninstall the damn thing and be done with it but maybe, next time I power up the mbam.exe time sucker won't be active. If it is, bye-bye malwarebytes.
Did the same thing with Spybot Search and Destroy. The real time scanner did shut down and seems to stay down.