Thanks Raman!..
but my AVG is free edition, it only could "move to virus vault" a infected file,
but it shows me:
windows\system32\com.dll
i go to that folder and didn't find com.dll, i search in computer but.. that file doesn't exist.
in other foruns i read some messages,people wich have that trojan, but avg show them other dll file, like ccl.dll, its strange that avg gives a different name for the trojan backdoor.agent.ba ,and i go to avg site (to virus encyclopedia) and they don't have a knowledge of this trojan existence.
thanks
silvio
portugal