hmmm... I dont really think there is a way. Sign up for a account at www.neowin.net and ask on the forums if you really want to know how. There are some hardcore nerds over there that might answer your question.
tweakxp.com should have it. I tried, you needed some hex editor or something. I gave up though because it only worked with SP1 (at the time I searched it) and I have SP2.