http://www.webopedia.com/DidYouKnow/Internet/virus.asp http://www.webopedia.com/DidYouKnow/Internet/virus.asp A worm damage your hardware, software and files http://www.webopedia.com/DidYouKnow/Internet/virus.asp http://www.webopedia.com/DidYouKnow/Internet/virus.asp http://www.webopedia.com/DidYouKnow/Internet/virus.asp http://www.webopedia.com/DidYouKnow/Internet/virus.asp Trojan horse http://www.webopedia.com/DidYouKnow/Internet/virus.asp mostly Worms or Trojans. Webopedia http://www.webopedia.com/DidYouKnow/Internet/virus.asp Internet Trojan Horse