"Antivirus and antispyware for free."
Avast! Free, along with Avira and AVG, is one of the most downloaded and appreciated antiviruses by users worldwide. Here you're offered the free version, a program that, although lacking the advanced features of the Pro Edition (antispam, the Sandbox technology to browse the Internet safely, or the anti-pishing system to make it safe to buy online), the fact is that it's excellent in its roles as antivirus and anti-spyware.
Avast! Free is excellent for use by users domestically (ie , at home). It includes a sophisticated analysis and risks engine that's fairly reliable and has regular updates that make your computer always protected, even as the years pass. A special feature of Avast! Free is its ability to detect unwanted programs, such as remote control, or commercial key loggers. However, you can always allow the operation of any of them at your own risk.
Advantageously, Avast! Free offers a simple interface from which you can monitor the status of each drive or each file separately, manually reviewing reports or scheduled scans.