Sure >>>>

Avast (you already have this)
MalwareBytes Anti-Malware (scan at least once a week)
MCShield (free scanner / AV only for USB drives) -

  • Download MCShield to your desktop and install
    • It will initially run a scan and show the result as a toaster by the system clock
    • Then in the control centre select scanner and tick unhide items on flash drives

https://dl.dropbox.com/u/73555776/mcshield%20unhide.JPG

- Plug in the drive and McShield will start a scan