DP's Security Bits

Windows Security Renewal is a fake anti-virus program that is part of the Rogue.FakeVimes family of computer infections. This program is classified as a rogue anti-spyware program because it deliberately displays fake security warnings, fake scan results, and makes it so you are unable to use your computer normally. This family of rogue programs are promoted using three methods. The first method is through web sites that display an advertisement that pretends to be an online anti-malware scanner. When the advertisement is finished, it will state that your computer is infected and that you should download Windows Security Renewal in order to clean your computer. The second method is to install the infection without your knowledge or permission when you visit web sites that have been hacked to display malicious code. This code will attempt to exploit vulnerabilities in Windows, Flash, Shockwave, Java, or Adobe Acrobat so that the malicious code can automatically install the software onto your computer without your permission. The final method is through Trojans that pretend to be a video codec or other software that is required to view an online video.

http://www.bleepingcomputer.com/virus-removal/remove-windows-security-renewal