After having recently been inflicted with the "Blaster worm" I am wondering - what is the difference between a worm and a virus? Also, how does one get a worm? I don't open email from people I don't know and I don't really surf much ... so I am not sure how I could pick one up. Lastly, anyone else a victim of this most recent worm? I have encountered a lot of people who have been infected and really wonder why a warning has not shown up on the news yet.