Ansav, Indonesia famous antivirus has new version ANSAV v2.0.37. You can download Ansav for free. Just go to ansav website.
Avast is powerfull antivirus, the run process not taking much memory, also avast has free license for home edition. You can upgrade to profesional edition to get better service. Avast daily update is very small, besides that avast also have personal firewall, protect your pc from hacker or cracker.
AVG one of the powerfull antivirus with free edition, besides scan virus it is also have link scanner to scan link if you are using search engine.
Advantage of AVG free :
it is free
low resource memory
have link scanner
Best free antivirus for 2009, eventhough it si free but you can count it to protec your pc from virus. I recomended some of them bellow.
1. AVG
2. Avira
3. BitDefender 10 Free Edition
4. ClamWin 0.94.1