I’ve tried out the free anti-virus app and I must say that I’m pretty impressed with Security Essentials. It’s able to tell me whether my computer is safe from any potential threats that might affect the system in just a few clicks. Besides that, it offers a comprehensive malware protection to guard against dangerous malware. Security Essentials runs quietly and efficiently in the background so that users are free to use their Windows-based PC the way you want—without interruptions or long computer wait times.

Even if you already have any anti-virus software on your computer, maybe you can give it a try and see whether it works much better than premium ones which cost a bomb. The software runs on Windows XP, Vista and 7 and requires a minimum of 140 MB of available hard disk space.