I'm running on a Toshiba laptop (plugged in).  I've manually started a System Scan from the 'Scan Now' menu.  It runs fine for a while and then I notice the 'Autoscan' message pops up and the laptop goes into full meltdown mode, fans screaming and things getting very hot.  Is it supposed to do this?  Doesn't Autoscan detect a scan already running?