"Free anti-virus, easy to use, is residential and with free upgrades from the Internet"
As you will no doubt already know, AVG Anti-Virus is a free anti-virus, easy to use, is residential and with free upgrades from the Internet.
AVG Anti-Virus also tests and protects email from possible virus infections. It takes up very little space, which, for an anti-virus, is very important. It also features protection from other malware like spyware, trojans, etc, plus link protection that scans Twitter, Facebook, etc. It also offers a file shredder and email protection, an online shield and a data safe by encrypting your data.
Other favourable points are its ease of use (you have only to click on the direct buttons to scan your whole system if you wish, the upgrades are automatic, visually you can see everything that is activated and what is not...) and the possibility to configure every process. It is an anti-virus way above average, and it's also free.