Some keyboard keys have been turned off

I've been struggling for weeks with this problem: CTRL , ALT , SHIFT , FN , and WIN keys are not working! When I bring up the on-screen keyboard, those keys function correctly. When I connect an external keyboard to my laptop, the same problem occurs, so I think it's not a hardware problem. I tried uninstalling the keyboard driver with no result. When running Sharpkeys, a software that allows remapping Windows keys using the registry, I found out that those keys were in fact turned off. So I deleted under the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout the

Question by Joe1983 on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.