keyboard mystery

[dr_hemlock2]

Okay, as I pride myself at being a computer technician and advanced windows user here is my problem.
I have windows XP with SP2 I have been using my Microsoft natural elite keyboard with this system for a year now. The keyboard all of a sudden stopped working in windows. You ask yourself how I know this, the keyboard works fine when I boot up to my bios page also while booting system keys light up as they should. Thinking maybe the keyboard is bad, it works on another system fine and my backup keyboard works on other systems but when plugged into this system nada. I unplug keyboard from PS/2 port on MB the system gives a keyboard error like it should. When window’s finally loads no keyboard activity at all no lights nothing. Went to device manager there is a yellow “!” right before the device name “standard 101/102-key or Microsoft natural ps/2 keyboard” which is what my keyboard is. Also on properties under device status it says “device cannot start error code (10)” looked this up on Microsoft’s site did what was suggested. Said to uninstall, reboot and will be fixed, right did not happen. Guys and gals I am typing this with a mouse using virtual keyboard and this has to end. I asked god and he sent me here please help me.
“Doc”