有錢劉的碎碎唸.

I experienced the same problem myself; fortunately, the solution is simple.  For some reason, the default value of some of the registry keys (not all) were changed in windows 7, which causes the system to apparently ignore the InitialKeyboardIndicators settings in the other locations.  All that is requireded is the performance of a search of the registry using regedit for that key.  It is important to use the find function to locate ALL keyboard keys forInitialKeyboardIndicators and set them to the same value setting.  The value options are as follows:

0 - Turn all indicators Off (NumLock, CapsLock, ScrollLock)
1 - Turn CapsLock On
2 - Turn NumLock On
3 - Turn CapsLock and NumLock On
4 - Turn ScrollLock On
5 - Turn CapsLock and ScrollLock On
6 - Turn NumLock and ScrollLock On
7 - Turn all indicators On (NumLock, CapsLock, ScrollLock)

In my case, the string value was some 7 or 8 digit number such as 21765430.  These entries are the cause of the reboot change in the num lock status.  If you want it on when you boot, set the string value to 2 in all the keys with numeric values.  Problem solved!

Ref

http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/want-to-set-num-lock-to-be-on-and-active-at/7b48ae6f-fa9c-4bc2-8359-81e0c5e5d6a2