Kaspersky Antivirus is one of the best antivirus to protect your PC from virus. It detects almost all the virus. Trial version also works properly.
You have to keep updating your kaspersky database so that it will have all the information about the new virus also.I am using this antivirus from past 3 years and it has protected from many viruses.
Once I had attented a seminar where they taught how to create a virus. After creating it we scanned it from all the antiviruse’s available in the market. Very very few of them had detected it and one of them was KASPERSKY. From that moment I realized this one is really a good tone to protect my files and data in my PC.
It doesn’t make your system slow but when you use licence version then in the last 15 days your SYSTEM / PC will become slow.