It sounds like you might have spyware running in the backround. You can try AdAware from Lavasoft.com or Spybot http://www.spybot.info/en/download/index.html if you want a couple of decent free anti-spyware progams. As far as antivirus, AVG has a free version at Grisoft.com. I find it's better than nortons just because it doesn't mess around with your registry and imbed itself all over your computer like Norton does.