Win7 keypad on the NumLock key we will often use, it is mainly used to switch keypad on the digital switch, to a certain extent to the user a lot of convenience. If one day you find the NumLock key is invalid, no matter how to click on the keypad is not open, you must first think of the keyboard is not broken. In fact, many times this is due to Win7 system setup problems caused the NumLock key temporarily unusable.
Recovery method:
First, on the keyboard while holding down the Win+r key, open the WIN7 System Run dialog box. Then enter the OSK command in the Run dialog box and press ENTER to open the Win7 on-screen Keyboard.
On the Open Screen Keyboard, click "Options" with the mouse in the interface shown in the following figure. Then, in the Open Options window, check the "open numeric Keypad" and then click the OK button.
After the setup is complete, the NumLock key on your keypad resumes use. In the future encounter this problem without the first time to think about the keyboard, hurriedly use the above method to repair it.