MS Wireless Keyboard Receiver Lights

I'm using a MS Wireless Desktop Elite KB with XP Pro. The receiver, which is
connected to the sys via a PS/2 port, has lights for the Caps Lock, Num
Lock, and F Lock keys. The F Lock light toggles on/off as it should, but the
Num Lock and Caps Lock lights on the receiver unit do not, even though the
these keys do seem to work. And toggling these keys produces a brief, and
correct, on/off message in the lower right hand corner of the monitor
screen. It just bugs me that the lights on the receiver do not toggle
properly.
Thanks for any ideas.
Al