There is a slim possibility that your mouspad plug has become loose.
If found, the drivers need to be re-installed or updated.However, sometimes, it will open the New Hardware Wizard which may ask for the driver.Unplug the Logitech keyboard.External mouse works.Nine times out of ten, this will resolve the problem.If it was the motherboard the keyboard would not be working at all.Do I need a new driver?Windows should recognise the keyboard and/or the mouse.If still not working your drivers may be corrupt crack internet filtering software and will need to be downloaded from the Asus support website.
Restoring the complete system will bring it back but it may be something to do with either the system drivers or keyboard driver.
Under the system startup repair utility (where the keyboard and mouse both work tried to revert to a prior restore point.

It is the driver.The drivers sometimes corrupt themselves.I hope this helps.The numbers should work now.It may be broken, unplugged, not compatible, or the drivers are corrupt.If it is a USB keyboard look under keyboard and USB devices.At this point the only other thing I can think of is reinstalling Windows, but I'm trying to avoid that at all costs.Youtube has tons of videos showing how to do this with various laptops.Uninstall the Keyboard driver.Failed outright regardless of which restore point I select (generic error).Error 106 is a typical blunder experienced by windows users.Appears generally because of Misconfigured, harmed or corrupt system files on the PC, this is certainly not a common error.1 Answer, why am I getting error 106?That is quite common and can be windows updates or spurious downloads that corrupt the system files.Restart your notebook and the keyboard and drivers will be reinstalled automatically and should be as normal, but check for any updated drivers at Sony:- p?sitevoe_en_GB_cons m2303 Jun 20, 2007 Sony vaio VGN-FS640W Notebook.May 20, 2010, dynex Multimedia Keyboard 1 Answer, my keyboard is not letting me type nothing, why?
If that's the case, you will have to remove the keyboard and reseat the plug.

Consult the laptop manual if that voids your warranty or not before trying, also look at the documentation on how to dissemble your laptop, it shouldn't be too hard.