Kids computer. Needs antivirus

Ok I have a PC in the house I put together for my lil one's



I Installed windows xp sp3 on it. In the past I have installed AVG on it and had keys that it didnt expire till 2018.
and was so simple to use you didnt need to do anything.

My issue with antivirus lately is all the messages, allow, deny, etc. keep in mind that they are young kids and have no clue what to do with stuff like this and I dont want to be bothered 10 times a day by them.(Daddy....Daddy the computer!...etc...) FFS this drives me nuts!

I use kaspersky on my pc but way too much maintance for there pc.
they play alot of games and some facebook. that is about it. no peer to peer on this one.

So any good suggestions on a simple A/V with a good crack or key would be great.

Please include a link in ur comments ET links only!

For the kids i'd say MSE(microsoft security essentials)You dont get lots of messages.
It validates fine on my pc with loader install so thats my rec.
MSE

msecurity essentials no pop ups simple and easy interface and no activation issue