I've been using Norton for years and never had a problem with it. If you are just using the antivirus and not the internet security program you can't expect it to pick up spyware, they are two different animals. You should always run two different spyware programs because none of them seem to pick up everything.
Another thing to try is this: go to Start-Run, type in "msconfig", go the startup tab and look at the list of programs that run at startup. That could be causing the sluggishness of your pc. There could be spyware or a bunch of unnecessary programs running whenever the pc boots up.
Or, you could just buy a mac!
