avast.com - Free Antivirus ScannerAvast detects and removes viruses, malware and other evil things from your Windows computer. Avast is free for home use only.
Avast runs in 30 different languages. It is a good free alternative to other Windows anti virus software such as Norton or McAfee.
Avast.com also has a free online file scanner where you can quickly check a specific file for viruses free of charge without installing Avast:
Avast is compatible with all Windows versions, from Windows 95 up to Windows Vista.
Another free anti virus tool is AVG.