I use NIS 2004. I got it OEM for £19, so the retail price as you can see is a bit extortionate. It has given me a few probs, it blocks everything at first, it auto-configures program acess to the internet, but the user has to change settings to get LAN to work properly. Also, when I play games such as American Conquest, I sometimes get a nasty warning telling me that either NIS or the integrated Norton AntiVirus has been tampered and needs to be re-installed. This is often solved by a restart, but is iritating and could be a problem if you are playing online. There are a number of large program updates though, some of which might be bug fixes etc. I haven't had any recent problems and the included LiveUpdate software can automatically downlaod and install updates. Otherwise, a great program, includes 1 year free AV update subscription with Symantec. Overall, very good, and if you buy the OEM version, not to expensive. (Norton Internet Security 2004, Win XP Pro with all available updates)