Hello! I try to found a solution for my problem, and i see some threads whith a similar question, but i still looking for a solution. Recently i connect two computers on network. One (Desktop) is directly connected to internet, and share the connection to the second (Notebook). The first is also sharing the printer. And each one share de default shared folder (both have windows XP Home). The Desktop have installed BitDefender Professional Plus, the Notebook have Norton Internet Security. I discover this files (setup.exe + autorun.inf) on shared folder of the desktop, when Norton (on Notebook) found and deleted setup.exe. But, a few minutes before the files are back to the same folder. I make a search on the Notebook, and didn't found any setup or autorun. One more thing: I don't have total certainty, but i recently installed the new Windows Live Messenger, and this newer version have the possibility to creat personalized shared folders to each contact. Can this two files be related with Live Messenger? One more thing, neither BitDefender or Spy Sweeper found the two files suspicious. I'm a little disapointed with BitDefender, and i'm thinking to install Kaspersky, what do you think about that? I attach the HijackThis log file. Thanks for any help that you can give me. And i'm sorry for my bad English, ok?