Can you plug in an external keyboard and get it to work?
This is the second or third time I have heard about this problem. That firmware fix should be removed from the ASUS Download Center.
The result is Windows misidentifying the keyboard. Manual replacement of the keyboard driver will fix the problem.
Go into the Device Manager and see what you have under Keyboards.
Here's my Device Manager, I have an external keyboard attached as well. You do not want to see any entry labeled ASUS Number Pad.
Your internal keyboard is the PC/AT Enhanced PS/2 Keyboard (101/102-Key) entry. Do you have this entry?
Right-click on one of the HID Keyboard Device entries and select Properties, click Update Driver, then browse my computer for driver software, let me pick from a list of available drivers on my computer, remove check in box to show compatible hardware, on left side click on standard keyboards, on right side select PC/AT Enhanced PS/2 Keyboard (101/102-Key), click Next, then Yes Let the driver load, return to Device Manager, Action Tab, Scan for hardware changes.
Let me know how that worked.