My Lenovo laptop keyboard only works if i hold down alt, but that is annoying.
Try a system restore to a date when it works correctly. If this does not help, try updating your drivers from mfg's website. You may have somehow set an 'accessability feature' in a funny way (does that actually make it an unacessability feature) so you can look through any features relating to your keyboard and see if you find something there that might help. You have to be a little bit crazy to keep you from going insane.
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