I would try to treat the disease rather than the symptom.
ry a repair of avast:
XP - Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow.
Vista, win7 - Control Panel, Programs & Features, uninstall a program, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow.
You may need to reboot after the repair. This has in the past resolved this out of sync issue between reported and actual VPS version.
If that doesn't work try, uninstall, reboot, install, reboot.
It works for me, but if the above doesn't resolve it then it is easy to disable.
AutoSandbox, Settings, uncheck the Enable AutoSandbox