For Windows Vista and higher, select Ease of Access Center. For Windows XP, select Accessibility Options. If your entire keyboard is locked, change the accessibility settings. This should unlock small portions of your keyboard. Use compressed air to remove any dirt and then test your keyboard again. If this doesn’t fix the problem, check for dust or debris under the keys. Press either key one at a time and then test the locked portion of your keyboard. If only a part of your keyboard is locked, the culprit is likely the Number Lock or Scroll Lock key being turned on or off. A driver is necessary for your operating system to correctly recognize and communicate with your keyboard. Though this happens rarely, having an outdated driver, especially when you upgrade your operating system, causes a locked keyboard. Other problems occur when you press certain keys such as Number Lock (also known as “Num Lock”), which may lock part of your keyboard. This changes keyboard settings, locking out certain keys or the entire computer keyboard.
One of the most common causes of a locked keyboard is holding the Shift key, sometimes called the keyboard lock key, for eight seconds or more.
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