On XP's "classic start menu" under settings there is an item Taskbar and Start Menu, it's also in the control panel, is there an easy way to remove this but only from the start menu, preferably by editing the registry?
I found a reference to using resource hacker to accomplish what you are looking to do. This goes a bit further then just a registry tweak, so YMMV. It implies that you remove the appropriate menuitem. I can't verify it on this system since it isn't XP, and frankly, I don't want to mess around with those files if I don't have to.