Security Shield is a rogue anti-spyware program from the same family as System Tool and Security Tool. Once installed, it will supposedly scan your computer for spyware, adware, Trojans and other malware. Of course, it will find numerous infections and then will prompt you to pay for a full version of Security Shield in order to remove non-existent infections. This fake security program will also display fake alerts and notifications stating that your computer in under attack or that your sensitive information can be stolen. This program is a scam. If your computer is infected with this malware then you should use our removal instructions below to remove Security Shield and any related malware either manually or with an automatic removal tool.