What is the best computer protection system?

I've always used Norton Antivirus as it came free when I first bought my computer, but I'm wondering if there are better and cheaper options out there. Anyone with knowledge out there?

What is the best computer protection system?vista

AVG Free and Ad-aware are the best and they are free. Go to www.download.com to get them.

I have used these 2 for years with no problems.

Norton is one of the worst anti-virus's you can have.

What is the best computer protection system?antispyware

You will get a bunch of different answers, I use McAfee and dont have any problems, you can get a trial for McAfee, etc.... and see how they work
Linux.... Actually, it's free. Solves the whole issue. And if you, say, need a new system, well, mac, OS X is only $149 for the "ultimate" edition, and the "basic" edition (joke). However, instead of worrying about how to protect you computer, get an OS that doesn't need to be protected, anything other than Windows. Make it dual boot Windows and your other OS, Like Linux (I like Ubuntu). So you can use your system without worry or slowing it down with antivirus and anti spyware, but still game and do other Microsoft only stuff.
spybot and ad-aware are really good but they are not antivirus protection.