I received an instant message with an attached file. The message was something like "Look at this, I just made it!". It was a worm of some kind. Avast! has been cleaning up the byproducts of the worm, most recently WIN32:trojano-2539, but I can't get rid of the root of the problem. I am using windows XP professional 2002. The main problem with the worm is that every time I use the internet, at some point the worm causes Internet Explorer to freeze. I tried Netscape, but the same thing would happen. Help!!!