theres quite a bit of info about sp3 here
http://www.winsupersite.com/faq/xp_sp3.asp
http://www.winsupersite.com/faq/xp_sp3.asp
This pre-release software is provided for testing purposes only. Microsoft does not recommend installing this software on primary or mission critical systems.
I don't think it is designed to 'fix' your systemif it aint broke don't fix it and mine aint broke.