Sysdefence is another rogue antivirus application from the wini family. This family of rogues has been quite prolific lately and typically is pushed on computer users through aggressive trojans that will appear on web pages masquerading as an update for flash player or a video codec for a video that may be well sought after. Once the user consents to installing this “update” or “codec” the trojan will then continue on to install sysdefence and complain about security alerts on the computer. It will complain about virus infected files and other security problems (all bogus claims) and will further say that it cannot repair these problems unless you purchase their software. Read on for how to remove SysDefence.