Webroot SecureAnywhere Antivirus 2015 is the tiniest antivirus around, its installation and scanning are both super-fast. The mega-suite is slightly bigger, but is still takes about one tenth the disk space of the average suite.
There are many others but I found this antivirus good antivirus.
I think Kaspersky is one of the greatest antiviruses. I have really used this antivirus and the result was very good. It is really on the top of antivirus list. So I will suggest everyone to use this antivirus. It will protect your data from viruses.