Enable the numeric keypad

Hello,
I have an HP Envy17. After several manipulations, my numeric keypad stopped working. The problem is not with HP or the Win7 that I have on my PC. It simply comes from a box I checked while playing "the apprentice sorcerer."
Solution:

• 1- Start menu
• 2- Control panel
• 3- Ease of Access Center
• 4- Under EXPLORE ALL SETTINGS click on "Make the keyboard easier to use"
• 5- Under the line CONTROL MOUSE WITH THE KEYBOARD uncheck the box "Turn on Mouse Keys".

... And everything goes back to normal.
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