No numlock key on MX5500 logitech - Logitech MX5500 Keyboard/Mouse

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I had a user with the same problem using a Microsoft wireless keyboard and mouse. This is a similar setup to most Logitech wireless desktop kits, there is one wireless receiver for both devices and it has a USB connector as well as a normally unused PS/2 (it comes with an adapter for the USB so you can use this on an old computer without USB). The user went on a trip and another "helpful" user that was in his office noticed the wireless receiver's PS/2 cable unplugged and decided to plug it in for him. I'm actually amazed that it worked as well as it did but Windows didn't recognize the keyboard correctly (103 key keyboard?). All I did to solve this problem was to unplug the PS/2 conector and load the correct software for the keyboard. I also put tape and a note on the unneeded connector to prevent this from happening again.

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Not on their wireless products (uses battery power), but you can download this handy litttle app that shows the CAPS,NUM,and SCROLL LOCK status on the screen. It also gives audible feedback when typing in all caps and when the status is changed.

http://download.cnet.com/NumCapsScroll-Indicator/3000-2072_4-10604212.html

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I would suggest the first point would be to install the relevant drivers for your operating system, these can be found via the following link:

http://www.logitech.com/en-us/433/3481?section=downloads&WT.ac=sc'downloads''dd

If you select your operating system from the list, it will then provide the download details - this should then install the relevant software to configure the keyboard.

Hope this helps.