Another highly rated antivirus software. Avast Home Edition 4.7.942 is completely FREE for for HOME users for NON-COMMERCIAL use.
You have 60 days to test the product. If you like the software and want to continue using it, then you have to register with them (still free).
This program guards your PC and network with multiple layers and can even scan executables downloaded on e-mails, p2p programs and more. The virus database is updated automatically at least twice a week.
I am quite impressed that you can download it in several different language versions including Malay and Chinese (simple as well as traditional).