With the bluetooth upgrade a while back, I have lost use of the number pad to the right of the keyboard. This keyboard does not come with a numlock key (

?). The numbers over the letters work fine. The number pad only works when I am holding shift while pressing a number.
I have tried using a few different keyboard selections in configure your desktop, and it may work for a few minutes, but it goes back to not working.
I went into Configure Your Desktop/Hardware/Input Devices/Keyboard/Advanced under caps lock key behavior, selected make caps lock an additional num lock. The number pad now toggles with the caps lock, but now I don't have a caps lock. I also don't know if this is a permanent fix.
Is there a way to assign another key that I don't use on this keyboard to toggle the numlock?