Hi. I wrote this Guide on disabling System File Checker in Windows XP Professional. Sorry it's not in text form. You guys want it simple so anyone could do it, what could be simpler than looking at pictures (besides a program that will do it for you, which I've thought about...).
http://www.overclockersclub.com/disablesystemfilechecker.shtml
Contact: ProfessorXP@Yahoo.Com