Avast Free Antivirus 8.0.1489

Avast! Antivirus is a widely used antivirus program, with 100 million users worldwide as of December 2009. Resident protection comprising individual modules or "shields", each of which can be individually configured or disabled.
Anti-spyware, Anti-rootkit capabilities and includes Self-Protection - Prevents malware from terminating avast! processes and damaging avast! files.
Automatic incremental updates - Updates of both the program and the virus database which is used to identify potential threats - Avast! updates its virus definitions on a regular basis (sometimes multiple updates daily) and this process is automated by default.