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Plug in an external Desktop USB keyboard to test. If keys work, use that external keyboard, to go to control panel and check/adjust some keyboard parameters. Some virus change some of those parameters to "disable" your keyboard.
Otherwise order a replacement laptop keyboard from HP spares/
Check to be sure your "Number Lock" or "Function Lock" keys aren't lit. These can lock out certain parts of your keyboard. If either of these is lit, press them to unlock the locked portion of your keyboard. These can be found at the top right on a laptop and between the number pad and main keys on a desktop keyboard.
Save all open programs using your mouse. Use your mouse to restart your computer. This will only work if your computer isn't frozen. If your mouse doesn't move, press the power button on your Dell until the computer turns off. Press it again to restart. If the issue was lack of memory or a locked program, this will unlock your keyboard. Continue to Step 3 if the keyboard is still locked.
Shut down your computer using your mouse or power button. Don't restart. Unplug your Dell.
Remove the battery if you're using a laptop by turning the laptop over and sliding the battery release latch. Slide the battery out and replace after one minute. For desktops, disconnect the keyboard from the desktop. Reconnect after one or two minutes.
Reconnect the power adapter or AC cord. Start your computer.
If your keyboard is still locked on a Dell desktop, disconnect the keyboard. Restart your computer and reconnect the keyboard after the system boots. Allow your operating system to recognize and reinstall the keyboard
Try using a USB or PS2 external keyboard to see if that works. If it does, then there is a problem with the keyboard on the laptop. I would then try reinstalling the driver for the keyboard to see if that helps. You would go into Device Manager to reinstall the driver. Let me know if this helps you.
i had the same prob with my sony vaio..but soon found the way out all by myself. first, run a thorough antivirus check and then reboot your comp. then reinstall your keyboard drivers. reboot your comp your comp again. your keyboard will be working. trust me..