Originally Posted by Norton
There should be a setting in control panel> power options> advanced that says "what to do when I press the power button"- you should be able to change that setting to "standby" it's probably set to "turn computer off" atm.
I don't have my XP rig running right now but maybe another member running XP will be willing to take a screenshot of the page with that setting and post it for you
that should help a lil bit. But Really- SP3 caused more headaches for many users.