Try following -
- Run Keyboard Troubleshooter
Type Troubleshoot in Windows Start Search box > Click Troubleshoot > Scroll down and click Keyboard > Run the troubleshooter > Follow onscreen directions
- Take actions related to Keyboard Driver
Windows Key+X > Click Device Manager > Expand Keyboards > Right click on entry below >
A. Rollback the Driver
Click Properties > Go to Driver tab > If there is rollback option, click it
B. Uninstall the Driver
Uninstall > Reboot the computer > The driver will be installed automatically when you restart
Do let me know if you have any more question or require further help. I would be happy to work with you to take you though this problem.