Maybe because of the fact i've seen just about every version there is in my short time here.
If it offends you that i ask...... you shouldn't let it...
Did you try and run the command line suggested ? ?
You may also want to go to Start/Run and type in sfc /scannow and hit Enter...
Have your XP CD handy as it will ask for it.
When done re-boot and see if the Control Panel applets are all there.