Malware Defense (or malware defence) is a rogue antivirus application that will install itself on your system and then claim that there are many security problems and even viruses on your system. It will claim that it can fix these problems (for a price) and may prevent you from downloading files to your computer from the internet. (It basically sets up web browsing through a proxy so that it can monitor and control all of your internet activity.) You should remove this pest from your computer. Read on for how to remove malware defense.