Norton's cool, but one thing though. If you get a virus that's come out before there is a fix for it, you're gonna get the virus and it will infect your computer. Once infected most viruses will also infect Norton, and from that point Norton will either be completely damaged, or it will no longer be able to detect that virus when the fix does come out. So, anytime you think there's a chance you might have gotten a virus, go to
http://housecall.antivirus.com and run a free virus scan. A virus can't infect that site so you'll know for sure if you have a virus or not.
The reason Internet Explorer has so much problems is kuz lots computer dorks don't like Microsoft, and they purposely try to damage IE and get everyone to hate Microsoft products and switch to others, like Netscape. Netcape works pretty good, but there are a lot of websites that can't be viewed in Netscape, and it gets pretty annoying. Especially fancier websites with flash and java animations. If virus software can't fix your IE, try Adaware 6 or Spybot. And yes, porn sites are the number one cause of these types of problems.