Sounds like a bad driver install. Uninstall the drivers using either Control Panel or NVidia uninstaller, then re-install the software.
NOTE: if you're using the latest version of GeForce Experience, it could be buggy due to the fresh releases. I suggest watching Science Studio's video (https://www.youtube.com/watch?v=I7HLZQw-p_U)
and see if what you're experiencing is covered by his talk. I personally don't use an Nvidia GPU right now so I hope this helps!