Sysinternals has another great utility to check what is actually loading on a Windows XP system on startup.

While you are there grab the root kit reveler!

Sysinternals Freeware - Autoruns

This utility has the most comprehensive knowledge of auto-starting locations of any startup monitor. You’ll probably be surprised at how many executables are launched automatically. It shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them, and it’s by Sysinternals!