Just a note on uninstalling McAfee VirusScan 8.6 for Mac:
Running the uninstaller command is the only way to uninstall this piece of $--- program. It comes with the program when you download it. (You can do so here:
http://www.versiontracker.com/dyn/moreinfo/macosx/10355)
It took me an hour to figure out, but if your password on your computer is blank, the uninstaller.command will not run. It will "permission denied" you. You must go to Apple:Sys Prefs: Accounts and change your user password to something with letters!
Only then will the terminal program be allowed to run and only then can you get this useless, memory-eating program out of your life forever.