Hi
You could try uninstalling the keyboard in Device Manager and then Rebooting.
That will make Windows redetect, reinstall it and reload the drivers for it.
If that doesn't work, do you have access to another keyboard that you can plug in to make sure that the keyboard itself isn't the problem?
Check and see if your NumLock key is working and whether it's on or off.
There were some issues with that during the test phase but not for a while, but it made some of my keys quit working.
Mike