I would suggest performing a system restore back to the time it was working correctly. I'd also run sysinternal's autoruns and check for anything suspicious, I've seen this type of thing happen before when a illicit program (keylogger, spyware) was hooking the keyboard.
Forcing hardware hardware redetection may fix it.
Boot the system from the WinXP CD. Have your CDKEY ready.
Select the “Install” option. (Don't select repair! The first repair option only verifies XP files against the XP CD versions and makes no system setting changes).
Setup will find the XP install that is already there and ask if you wish to repair it. Say yes.
Setup will run the upgrade code that will re-enumerate the hardware.
Also,
You can use this registry file to force device manager to show hidden devices:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]
"DEVMGR_SHOW_NONPRESENT_DEVICES"="1"
Then check for any grayed out phantom devices, right click and remove them in case they are interfering.
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