Sorry to bump, but just had to point out, OP was wrong about Avast creating a random 8-digit folder every time...
It isn't creating a random 8-digit folder...
It is creating a very predictable 8-digit folder...
The number is YYMMDD##
YY = Year = 11 = 2011
MM = Month = 09 = September
DD = Day = 26 = Twenty Sixth
## = Normally '00', but will increment if it has run more than once in the same day
(suprised nobody else noticed that ^.^)
-- Smoov