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Perfect explaination of the problem, thanx. The enter key on the number pad is long vertically and ideally should NOT stick... I've seen this problem on some older keyboards, this is a mechanical / design failure. Please take the part back to the seller & get it exchanged for a working one.
It's most likely not a virus. To make sure of that first (if possible) plug in an external USB keyboard and try the keys that are not working on the keyboard to see if they work now. If they work now then there is an issue with the laptop keyboard.
Second make sure that the "Function lock" or "Num lock" button(s) are not pushed, sometimes these features interfere with the functionality of the keyboard. If they are not pushed then you will need to replace the keyboard. If the laptop under warranty then simply call up HP and let them now you are having an issue and they will ship you a replacement. If not then you will need to purchase a new keyboard (I recommend to buy from the manufacturer, but it's really up to you).
If purchasing a replacement keyboard is not an option, then you could try to remove the keyboard yourself (easy to do, most likely there is a few clips to remove then 1 or 2 screws) and try to see if there is anything in there causing an issue (dust, bread crumbs, and in my case hair). If you can clean it up a little bit and re-install it and you should be good to go.
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..