TweakUI

This allows you to tweak some options that you can't do in windows unless you know how to program in the registry.

I mainly only use this program to hide and show certain items in Windows and really is an advanced user program as changes made can affect the users productivity and may be hard to recover if you don't know what you did.
Some of my posts describe how to use this software to perform certain tasks, so if your not an advanced user you can still download this software and only use it following my posts. TweakUI has a proper graphical interface so it is easy to use if you know what your changing.

http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx > Scroll down half way and on your right hand side you should see a link "TweakUI.exe"

Windows XP only, i think