Ah, Nvidia advises you not to do that. You probably have by now but I'd do a DDU clean in safe mode and reinstall to start afresh.
Do Not Use Windows Rollback for Graphics DriversTo reinstall a previous or older NVIDIA graphics driver, do not use the Windows rollback feature. This method will not reliably restore all the previous driver files. Instead, use the Windows Add and Remove programs to remove the current driver, and then install the older driver using setup.exe.
Uninstalling Drivers Using Device Manager is Not SupportedIssueOn all supported versions of Microsoft Windows, uninstalling the NVIDIA driver using the Windows Device Manager may not remove associated files or applications.ExplanationMicrosoft has confirmed that this behavior is by design. If you wish to uninstall the NVIDIA driver, it is recommended that you do so using Add and Remove programs
https://us.download.nvidia.com/Windows/460.79/460.79-win10-win8-win7-release-notes.pdf