By a simple script you can do this, first of all you need to create notepad file in your desk top and there write the following script and save the file with "numlock.vbs" file format.
Code:
set WshShell = CreateObject("WScript.Shell")
WshShell.SendKeys "{NUMLOCK}"
Now go to start menu and insert by type mmc in search command prompt. This will appear the Microsoft Management Console (MMC) window, from the console window select Add/Remove Snap-in option. In the group policy section insert the default object if this one listed, otherwise browser the object from your machine. Now in the group policy windows select the mmc file which you created earlier, double click on the object file and click on add option, after adding this file you will be able to choose either enable or disable option. Close the Group Policy Management console and reboot the machine. Try this it will help you surely.
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