More RAM (memory).
Turn off the "bells and whistles" that makes XP "pretty".
Turn off useless services.
Scan your system for visruses and spyware (after updating said-software.)
List - except to drag and drop each name on the list -
one at a time - in it's proper place alphabetically.
That is a very slow process! There must be a better way
to do that in this day of technical wizardry???>.