Shiela USB Shield is a powerful first line defense against virus from infected removable drives. it locks autorun.inf and associate executable files in multiple instance, Delete/Freeze the shortcut file or clone file, and restores the original automatically. It is free and open source.
October 31, 2013
Version: Shiela USB Shield 3.1.1
This has the easiest install you probably will ever come across. It's very small in stature and use of system resources. Very easy setup. Everything is accesible through system tray icon. It's scans very fast. It scans my 500 gig external HDD in about 3 seconds!
It isn't very pretty. There isn't anything telling you when there is a new version available.
I have tried 'em all and this is the fastest and smallest of the bunch. It even has a memory optimizer you can adjust to clean memory on a schedule. I tried USB-AV Free and it is good but the web page is no longer availiable and the software is two years old already. Shiela Is New This year and already has an new version on Sourceforge. Version 188.8.131.52. It just works and works good.