Sony Vaio Latop.1. Clean install to Windows 8.1 Pro- Built in Keyboard/trackpad and mouse buttons work fine.2. Apply all patches for 8.1 - Built in Keyboard/trackpad and mouse buttons work fine.3. Upgrade to Windows 10 - First pass, Built in Keyboard/trackpad and mouse buttons work fine.4. Apply patches-Second pass, Built in Keyboard/trackpad and mouse buttons work fine.5. Complete patch installation and reboot.

Built in TRACKPAD AND MOUSE BUTTONS are AOK. Keyboard is NOT. (Using on-screen Keyboard.6.

Windows Update: Seemingly stuck on Cumulative Update for Windows 10 Version 1511 (KB3163018) in 'downloading' state. Hard wire connected to GBit LAN.Troubleshooting:Apply all conceivable updates from Sony site (Firmware, System, Motherboard, etc.Remove PS/2 keyboard from Device Manager - Reboot. It rediscovered it:Device Configured (keyboard.inf) Device Started (i8042prt)Microsoft Driver / 6/21/2006 / v10.1.10586.0 / working properlyWhat to do? As you can see, I am somewhat versed:-). Ho Scotty,I realize the inconvenience you are experiencing with keyboard. I will certainly help you.This issue might have occurred due to the corrupted keyboard drivers. I suggest you to try the methods below and check if this helps.Method 1: Update Keyboard driver.Follow the steps to update the Keyboard drivers:1. Press Windows key + X key and click Device Manager.2. Expand the Keyboard.3.
Right-click on the Keyboard driver and click on Update driver software.4. Restart the computer and check.Method 2: Try Uninstalling and then reinstalling the keyboard drivers.Follow the steps below:1. Press Windows key + X key and click Device Manager.2. Expand the Keyboard.3. Right-click the keyboard driver and clickUninstall.4. Restart the computer, let Windows detect the driver and install by itself.Method 3:If the issue still persists, I suggest you to install the latest keyboard driver in a compatibility mode and check if it works.Follow the steps below:a. Download the latest driver from the manufacturer’s website.b. Right-click on the driver setup file and click on ‘ properties’.c. Click on the ‘ compatibility’ tab and check the box ‘ Run this program in compatibility mode for’and select Windows 8/8.1 operating system from the drop down menu and proceed with the installation.Once this is done, restart the computer and check if the issue persists.Kindly let us know the status of the issue to assist you further.Thank You.