Thank you, this worked for me too. Though, I had a slightly different problem in that the brightness slider actually disappeared from the display settings. There was also no check box for 'change brightness automatically when lighting changes.' It was just gone. Also, the slider in the system tray was completely grayed out. Everything looks good now after uninstalling the driver and restarting.
I have this problem too! did you figure out how to fix it?!?!?