I use G-Data Antivirus, VERY powerful. It's easy to turn off when you go racing. If you use it for the first time it's a bit anoying tho, it has to learn every outgoing connection to the internet. That means it won't let you on any website the first time. it checks every connection and asks you if it is allowed to connect, once the program nows these paths it's very easy to use. It comes with anti spam, webfilter, firewall and childlock.
The only wierd thing it has is that it gives a message from time to time regarding mIRC. It doesn't like that program for some reason.
If someone nows more about that, tell me. I could use some advice on that. I will post a screeny if i encounter it again.