Before you start making configurations in order to speed up the start-up of Windows XP, you need to be familiar or sure of what you are deleting or stopping. This may lead to the crippling of major Windows XP operations which could lead to crashing of your PC. However, with the aid of the links provided by our fellow TestFreaks users, I'm sure you'll be fine.
Have a moment to read this article I found at the PCMAG website:
Making Windows XP Start Faster - Expert Help by PC Magazine 
Good luck!