Other AV programs advise the making of an emergency start up disk, or similar, in case one cannot use an infected computer in the usual way.
Avast4.5 , as far as I have been able to see does not mention this. If the matter is somewhere please point me to it. If not I'd be interested tp learn why it is not nneded. Thanls very much. BTW the scanner has picked up 2 suspect emails already and seems to work seemlessly.