http://www.theregister.co.uk/2010/05/07/argument_switch_av_bypass/
Researchers say they've devised a way to bypass protections built in to dozens of the most popular desktop anti-virus products, including those offered by McAfee, Trend Micro, AVG, and BitDefender.
http://www.matousec.com/info/articles/khobe-8.0-earthquake-for-windows-desktop-security-software.php
Why are user mode hooks insecure