If you can’t get enough of the default options in Windows XP, and want to tweak it to the utmost level without getting into the registry and messing up with stuff, you could download any one of the following software that let you tweak Windows XP easily:
TweakUI
TweakUI gives you access to modify settings that necessarily cannot be changed in Windows XP. Over a hundred default settings can be modified by using the TweakUI Control Panel Applet. Integrating very well with the default interface, this tool is very lightweight as well.
Download Tweak Windows XP