Here is an absolutely essential program that makes EndItAll practically redundant. It's called Startup Manager, and it's free.
Highly Recommended
http://www.wheresjames.com/Also, If you want to forget about FS autostart and use the inbuilt WinXP management program to control the services, (you may as well because you have to understand them anyway before you can safely shut them down) GoTo.......
Control Panel/Administrative Tools/Services
It's all there, definitions, control and dependencies.
You may have to enable administrative tools to see them if you haven't already.