If you don’t have an anti-virus installed on your computer, and don’t want to pay for one, you might want to try one of these, free ones.
Alwil Avast 4 Home Edition: VB100 and ICSA certified, on-access and on-demand scanning, e-mail scanning for Outlook and POP3/SMTP, automatic updates, e-mail technical support, 7.1MB.
Grisoft AVG Anti-Virus System: VB100 and ICSA certified, on-access and on-demand scanning, e-mail scanning for Outlook and Outlook Express, automatic updates, 5.7MB.
H+BEDV Datentechnik AntiVir Personal Edition: ICSA certified, on-access and on-demand scanning but no e-mail scanning, automatic updates (after fairly significant configuration effort), 3.8MB.
Softwin BitDefender Free Edition Version 7: Uses same scanning engine as the VB100- and ICSA-certified Standard Edition, on-access and on-demand scanning but no e-mail scanning, automatic updates, 8.8MB.
See an article at PC World.com here.
All these free antivirus never work like the paid version of antivirus .they cant track the latest threats .Only a few can be traced .And moreover they eat up all your computer’s resources