Hi
Try unplugging you Keyboard and navigating with just the mouse.
Then do the same thing the other way around, and see if the problem persists.
Try logging in, in safe mode and see if the problem persists.
If you can log in it safe mode and it works normally try checking to see if your video drivers can be updated, and run SFC /scannow from the elevated command prompt.
Run Malwarebytes and see if you find any malware.
Do you have any restore points before the problem started?
Come back and let us know of your progress.
Someone may have other suggestions.
Mike