For those of unfortunate users of the old IBM Thinkpad T43 there is an annoying feature that enables a numlock on the keyboard. This should fix most Thinkpads that have numbers on the keyboards instead of the regular 10-key on the right side.
2. Navigate to HKEY_USERS\.Default\Control Panel\Keyboard
3. Change the value for InitialKeyboardIndicators from 2 to 0.