I took Norton AV off the laptop about a week ago and installed avast! which is free and which so far works great. The computer now boots up in half the time, runs faster, and doesn't heat up nearly as badly.
Norton: The anti-virus software that acts like a virus!
And don't even get me started on McAfee, which refused to install an update on my home machine because I also had Spybot S & D installed. So McAfee (which has often missed stuff that Spybot caught) gets kicked to the curb as well.