Avast Anti-virus Home Edition is a great free software to get rid of those unwanted viruses.  It’s a strong alternative to AVG Free anti-virus.  Personally, I have not used the freeware but have heard of many great reviews about it.  Here are some key features of Avast:

– Anti-spyware built-in
– Anti-rootkit built-in
– Strong self-protection
– Antivirus kernel
– Simple User Interface
– Resident protection
– P2P and IM Shields
– Network Shield
– Web Shield
– Automatic updates
– Virus Chest
– System integration
– Integrated Virus Cleaner
– Support for 64-bit Windows
– Internationalization

You can download it via the Avast website.

avast antivirus home edition

Avast Antivirus