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XP Pro won't boot past alt-ctrl-del screen

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Last Modified: 2012-05-05
Suddenly, My Toshiba laptop will not boot past the alt-ctrl-del screen, so I don't even get to a login prompt.
Hitting the alt-ctrl-del combo does nothing.   In fact, while  my USB mouse isn't recognized, my touch-pad mouse works initially... I can move the alt-ctrl-del screen around anywhere I want.  I can even click on "help" and see the animation, but as soon as I hit any key whatsoever, the mouse stops responding.  Also,  

I would suspect a hardware problem, except that I can get into the BIOS and keystrokes all work correctly,  I booted in Knoppix and the keyboard operates normally.

I ran a repair operation from my SP2 CD and was informed that windows had made repairs to my installation, but on reboot the same problem still exists.

This all leads me to believe that Windows alone can't communicate with my keyboard.  This probably means the problem must be in the Hardware Abstraction Layer!?!   Does anyone know how to reinstall the HAL, maybe from the Recovery Console?

Thanks for any suggestions.
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