1 avast! can’t kill them
how to sumbit them to the avast! virus lab quickly
2 the main position of OS protection
such as host table,some register options and more
it can prevent viruses from modify these options
Sorry about that …
but if you would care to tell us a bit more about the problem then folks here are willing to help.
I’ve answered some of your questions here:
http://forum.avast.com/index.php?topic=35581.msg299237#msg299237