For years now I have been fighting virus scan and other programs.
My employer forces our machines to run certain tasks and they really slow everything down.
My solution to this point has been to run Task Manager and kill these processes. They seem to start up again intermittently during the day so I have to keep going back to Task Manager whenever my machine seems to be running slow.
A friend at work told me about "taskkill". It does the same thing I've been doing manually. He created a .bat file and put in a few taskkill commands to kill the unwanted tasks. Now we just run the .bat file and the evil, harddrive sucking programs die.
taskkill /f /im vulscan.exe