I highly recommend Comodo Internet Security. It's free but has a paid version.
It combined Comodo's firewall and antivirus into one single application which runs in the background. It has on-access file scanning (that is, if you download a file, it is scanned immediately, and any time you open a folder which contains files, the files inside are scanned before they can be opened. The firewall is nice because it shows pop up alerts for outgoing programs which makes it easy to not only identify WHAT is going WHERE, but also stop it if you don't want it to. Most firewalls do this but I've never seen one that didn't slow down your computer (ZoneAlarm was really bad in that regard).
The AV picks up a lot of false positives, I find...it gets annoying. I've never had an actual virus it did not detect though...I've tested by downloading known-infected content and it always picks it up. It gets multiple updates per day and instead of popping up a full blown updating window it just pops up a 'balloon' over the system tray to let you know it is updating.
comodo.com...if that's not right just google it.
About norton...yeah, it's bad.
Once upon a time Norton, founded by Peter Norton, was a fantastic company. It produced productivity software and shells for DOS...fantastic products. They also published a couple books which are handy for pseudo-technicians like myself. Now though, their software takes up a lot of space, runs slow, and since huge portions of it stay memory-resident at all times, it slows down even the most modern computers. Plus, it has major compatibility issues with popular software and even some drivers. My neighbour works at a call centre which handles tech support for an ISP in the states and a couple different wireless router manufacturers...I'm told that Norton causes a lot of compatibility issues with certain router brands as well.
Vista doesn't actually have any issues...the complaints are from people who want to run older software, use their legacy hardware, or are not familiar with the new interface. I prefer older versions myself...I find the 'sweet spot' in Windows development was 2000 SP4...just runs perfect, all the time, I've never had any issues with it. XP is the next best thing to me.
95 was probably "the best" because of being revolutionary...at least in the "PC" world. Mac had it beat in the GUI department long before.
/rambling