You can set your Num Lock to stay on by default when you logon your system.
There are two different techniques to set Num Lock stay on by default.
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If you can use Registry Editor correctly then Click on start button and type Regedt32.exe in Run command. Here Navigate to HKEY_USERS\.Default\Control Panel\Keyboard and change the value for InitialKeyboardIndicators from 0 to 2.
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