USB auto scan for Avast Internet Security 6.0.1.

Hey,
On our school we have Avast Internet Security
On our desktops with Windows XP or Windows 7 32bit en,-or Windows 7 64bit

Now, I try find a way for setup a auto-scan when users connections they USB sticks.
(Windows 7 64 bit)

But I can’t find it how.
Note: I have found the Auto Run scan, but these is not enough for school desktops.
Also I have found a way for: scan all files when they will open (can make you pc slow) and I’m pretty sure, desktops on school are not fast enough for turn these option on.

I never have searching for these option but now I need to do that:
On 6 desktops and a lot of usb stick, we have founding: win32:malware-gen

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