While attempting to change the administrator password using Service Pack 3, I
noticed that the keyboard driver was not working and windows did not detect
it within the hardware list.

I had to use the onscreen keyboard as an alternative, this problem did not
exist within Service Pack 1, 1a or 2.

My keyboard uses the standard 101/102-Key or Microsoft Natural PS/2 Keyboard.
I am using a slipstreamed XP Service Pack 3 installation build
2600.xpsp.071130-1427.