What happen?

I use avast to scan my computer.
But it can’t search “trunk.16” and “trunk.32” virus. ???
How do I Kill the virus?

Sorry, it is “twunk_16” and “twunk_32”.

What does avast detect?

twunk is a twain driver

http://www.programchecker.com/file/349.aspx

You can google twunk for more info.