On one of my windows boxes I was simply unable to use my favorite backlit keyboard. It’s a USB device.
After much frustration – I found that copying this file from another machine fixed it:
C:\Windows\inf> dir usb.inf
Directory of C:\Windows\inf
11/20/2010 10:28 PM 42,536 usb.inf
I do a lot of cleaning (and deep cleaning); my bad for clobbering that file.
New notebook computer; I always clean out as much crap as possible.
Tried all the usual things – add/remove IE, WMP, whatever.
run regsvr32 on all these: