GreatDefender is a rogue antivirus application from the winisoft family. It is installed onto a system through the use of trojans and other malware which should give you an indication that it is not something that you want on your system. (It’s usually a bad sign when you don’t know where a piece of software came from.) Once on your system it will run at boot and complain about security problems that it has found on your computer. It will further scan for viruses and consistently find viruses (even if it’s installed on a fresh windows installed it is guaranteed to find something to complain about.) Don’t fall for this scam and pay them for this software. They claim the problems found can only be fixed by paying for this software, don’t buy it. Instead, read on for how to remove greatdefender.