USE KEYBOARD WITH MOUSE

If you feel that your external keyboard is not working properly or
 some particular key is not functioning then you can use internal keyboard on your desktop screen.
This property of keyboard is found in windows xp , 7 , 8 and 8.1   Just follow these steps
Go to start menu and press “run”
Type  “osk”
Now press enter.
(note. Don’t use commas)
you will see keyboard on your desktop screen. Now use mouse to click on keys for operation.