I mostly run Linux (where this is obviously not a problem), but we have windows clients as well and they are always prone to flash disk autorun viruses - I've used avira in the past, but it only protects by disabling access to the inf file. If a system is already infected (and thereby infecting every flash you stick into it) Avira blocks it from spreading but does not remove it from the original PC - what is the best anti-virus to use to remove these?