After installing a Windows update in late March, I shut my laptop down after installing the update. The next morning, when I went to log back into the computer, the internal keyboard did not work. I didn't realize it at the time, though I've since worked it out with a technician's help, when the computer boots up into windows, the keyboard stops working, and it will continue to not work when restarting. However, on a cold boot after turning the computer off, the keyboard responds fully outside of Windows. I can go into BIOS etc outside of Windows and use the keyboard perfectly fine. However, the moment it reaches Windows, the keyboard ceases to function. This apparently means that the problem is a driver/software issue, is my understanding.