AVG Anti-virus is world renowned free Anti-virus and spyware software that almost everyone with Windows have got installed on his computer, Recently they released 8.5 Version with some new features with enhanced security features and scanning your computer against virus is a breeze and while you surf the Web it automatically scan every website for possible trojans or other malwares and keep them from installing on your computer.
You can get your free copy here : AVG Anti-Virus 8.5