http://free.grisoft.com/
AVG Anti-Virus is one of the top Anti-Virus programs out there. Their free version, for home and non-commercial use, is a great alternative to the paid anti-virus programs that are available. It comes with all the standard features of a good anti-virus system;

• Automatic Updates
• Real-time protection for active and downloaded files
• Scheduler for regular scans
• A virus ‘vault’ for handling infected files

It also uses very little system resources, unlike a lot of anti-virus programs that are bloated, running AVG will not slow you down at all. Once installed, AVG runs in the system tray, protecting you from the latest virus threats, without any extra hassle. You are notified when updates are installed for you and any results from completed system scans are displayed.

So if you’re looking for a new anti-virus program or need to replace your current one when the subscription runs out try AVG, the free version is available here.