Lately I have been researching on Windows SFC (System File Checker) mechanism which is used to protect system files against accidental or deliberate modification. I have written about it in more detail as how this technique can be utilized to differentiate between system and normal components.
Today while surfing on the net, I came across very good article which explains how one can disable this SFC protection on the fly. By the way there are many ways (manual ones) exist to defeat the SFC protection but this one describes core method of disabling it based on the analysis of SFC implementation.
Read the detailed article on “Windows File Protection: How To Disable It On The Fly”