As we all know antivirus is the essential software of computer and windows. because it is the only one who protects our files from the virus and corrupted files.A good antivirus has a real time scanner which is the only one to protect our computer from virus .hence we should always update our antivirus timely and enable auto scan for usb storage devices.
by doing updation of antivirus we could get more lifetime security of the our computers.
AND guys use always paid and licensed softwares.