I did not damage my keyboard, I cleaned all dust and all food particles from my keyboard, I uninstalled and reinstalled my PS/2 Keyboard driver, and I restarted my Windows 10. None of these methods work, so I think that my PS/2 Keyboard driver is completely out-of-date. My PS/2 Keyboard driver should be updated and this is why I need a driver updater.
Dick
Go to download.com (CNET is parent company) and do a search for Driver Booster. Download and install the software and it will do the install and immediately review all of your drivers and do a search for the latest drivers. Once that is done you can simply allow it to install all the newer drivers it finds, or you an select which ones you want to update. The general tech opinion regarding updating drivers is "if it isn't broken, then don't fix it!" So you might want to opt for only updating the driver for you keyboard. Hope this helps.