Got struck! is your laptop typing wrong letters ? The possible reason could be that NumLock key state is turned on. Usually laptops do have a special key “Fn” which can be used in combination to of “NumLock” to turn this feature on or off.
If you do not find a “Fn” key try combinations of “Alt + Num” or “Ctl+Alt+ Num” key.
If even after doing this you are not able to find the solution. Try this trick go to Accesories –> Accesibility and click On–Screen Keyboard. This will show a small onscreen keyboard utility which comes with windows.
Simply click highlighted “nlk” or “NumLock” key depending upon your OS ( Windows XP or Vista or Windows 7) to turn “NumLock” off.