Unlock keyboard
Well you may have a bigger problem than a locked keyboard. If you tried to shut down all your programs and reboot, and if you could reboot as someone else to see if it it a locked keyboard. By rebooting the keyboard should auto unlock however if your using a wireless keyboard (check your batteries), and finally on this machine there is a problem with using USB keyboards, try to unplug the USB keyboard then waiting 10 seconds, then plug it into a different USB port, this will reset the keyboard in some cases, but it may be necessary for you to reload the keyboard driver. Okay you say how do you do that without the keyboard? Well if your mouse is working go to START>PROGRAMS>ACCESSORIES>ACCESSIBILITY>ON-SCREEN KEYBOARD and use your mouse to reload the USB keyboard driver and see if that fixes your problem.
Good luck!
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