try deleting the INF files for your keyboard and uninstall the drivers in device manager, then restart your computer.
should force windows to reinstall the driver for it.
to find the inf, open up your keyboard driver in device manager - Details tab - INF name
- that should tell you the name of the INF (usually its keyboard.inf)
go to C:\windows\INF scroll down until you find the name and delete the file (could be 2 of them
do you know what files