Hi Les,
This could be due to incorrect hardware settings due to the upgrade, missing/corrupted/outdated keyboard drivers etc. Let's try the following methods and check.
Method 1: If your computer is having problems with a recently installed device or other hardware, try using the Hardware and Devices troubleshooter to fix the problem. It checks for common issues and makes sure that any new device or hardware attached to your computer was installed correctly.
Open the Hardware and Devices troubleshooter by clicking the
Start button
, and then clicking
Control Panel. In the search box, type
troubleshooter, and then click
Troubleshooting. Under Hardware and Sound**, click** Configure a device.
If you're prompted for an administrator password or confirmation,
type the password or provide confirmation.
Method 2: Please refer to the article below from the section Keyboard & Mouse.
Personalization & Ease of Access
Method 3: Visit the computer manufacturer's support website and install the latest keyboard drivers for the same computer model as you have.
Hope this information is helpful. Please feel free to reply in case you face any other issues with Windows in future.