I have used kaspersky internet security for 1 year and I can say that’s its the best antivirus as far as security concern. U can do net banking, important file transfer and other works without any tension of malware or any kind of virys attacks. Bt there is a lots of problem with this product.first this antivirus is too costly compared to guardian or quickheal pro. Secondly u can’t play any crack games u have to pay for the full version . But the most important problem of this perticular antivirus is it take too much of space and makes the computer slow. So if ur main purpose is to protect your inportant document then buy this bt if u are a student or need antivirus just to protect your pc I think u should look for other one