Its urgent
SOURCE: PROBLEM WITH KEYPAD ON LENOVO 3000 C100 PC NOTEBOOK
Laptop keyboards are extremely sensitive to debris. Before spending any $$ on solutions you should check to see that staples and crumbs have not lodged under the keys. Using a small screwdriver or butter knife you can gently pop the keys that are causing problems off (be very gentle, laptop keys usually have several parts so you dont want to loose or break the parts). Once you have a side pried up then you can use compressed air (or a good shaking motion) to make sure nothing is lodged under the keys.
SOURCE: key board problem
Press FN (next to CTRL) and NmLk (probably above F11) simultaneously. This should return your keyboard to normal.
If that doesn't work, try SHIFT+NmLk and that may work as well.
SOURCE: Keyboard problem in Dell Latitude PPX C Family
Actually this is a common problem with these Dell's. I have never found a cure for it other than replacing the keyboard. Fortunally they are not expensive, you can usually get one off of eBay for around $20 or so.
Hope this helps
SOURCE: My Gateway laptop - 2 yrs old - just developed
Sounds like you have turned on the NUM LOCK on the laptop keyboard. If
you look closely you will see the numbers on those keys (maybe in a
different colour).
You need to turn off NUM LOCK again. On the
laptop I'm looking at, this is done by pressing Fn and END together,
but the key should be marked with NUM LOCK as well.
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