How about you use win+R to bring up command prompt, and kill any processes with names in a list of known AVs?
Also, you could use /T ot terminate child processes, /F to force everything, or /FI for a filter.
taskkill /IM Mcshield.exe
taskkill /IF Mc*
(for McAfee processes)
I don't know if you know this, but AV like McAfee with give you annoying pop up warning when something is disabled, so it's probably better to kill it all together. Besides, I think this would be much more effective than guessing where to make mouse clicks...