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