Nod32 is a better one cause it don't use up you too much RAM, you can go on to the Nod site,
www.nod32.com.hk, you can download a test version, but it only last for 30 days, if you like it you have to but it.
Nod is better cause it will scan the file that you download, if it got virous it will stop it immediately and delete the file. Nod32 save my computer once.