The NUMLOCK key is off after you logged on to your system
Might be a setting the BIOS of the system.
To change this behaviour you need to change the registry setting HKEY_CURRENT_USER\Control Panel\Keyboard.
Here you find the REG_SZ InitialKeyboardIndicators which should have a value of 0.
NUMLOCK off = 0
NUMLOCK on = 2
You can copy the following to a reg file and load it.
Windows Registry Editor Version 5.00
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.