If you still have problems after doing what Kemical suggests you can try logging in, in safe mode.
Go to Device Manager, uninstall your Display Adapter and when asked say remove the drivers.
Then reboot in normal mode, this should force Windows 10 to detect you video card, reconfigure and reinstall the drivers and settings that it thinks will work.
Don't try this until you have tried Kemical's suggestions first.
While I don't mind uninstalling most things and letting Windows reinstall it, I'm always a little uneasy about uninstalling the Display Adapter, because it's so hard to get Windows 10 back into Safe Mode from boot to restore it back to the way is was.
If for some reason it decides not to do it's thing, and reload the drivers, it can be a hassle.