Mozilla (Firefox) is good. Forget Yahoo Messenger. AVG is an anti-virus program. Have someone show you how to use AVG. I prefer the Mozilla browser (Firefox) to Internet Explorer. Firefox is faster and simpler....
The thing about AVG and other “freeware” AV programs is that unless you have purchased the full version it will not remove viruses/spyware/adware. Not taking away from them, because I use AVG, but your normal user will not be comfortable working with the registry.