If you are an advanced system user, then you would definitely be very knowledgeable about different viruses that can cause potential harm to the data stored on your system, and thereby you would already be using one of the antivirus softwares. But the novice users might not be very familiar with the potential threats that can harm their computer. So, we advice such users, to get the installation of a good antivirus software or firewall at earliest, and update it after regular periods of time in order to ensure the security of data and safety of system. The choice of antivirus software of course matters a lot in this regard; thereby you should research a little before you install one of the softwares. Norton Antivirus, Avira, Ma Café and Kaspersky are among the most used softwares all over the world.