I will say don`t go for fancy ad`s about antivirus. If you are a advanced user of computer you must be knowing that most of the time virus infects our pc by our own mistakes if you are a heavy internet user chances are that you may get some virus. but if you are a casual user don`t worry about it too much. and you dont need any advanced paid antivirus software go for avast or avg free antivirus rather than paying for some antivirus software like quick heal, net protector, norton, e.t.c. seriously you dont need one.
An advanced user will never need any antivirus software because he/she knows about what they are doing on their systems so never go for any ad`s about the threat of malware, virus, e.t.c. free antivirus software have always proved to be better than a number of crap antivirus available in Indian market the only thing suck antivirus does to your pc is making them run slower.