If there's a previous version that worked, then I'd just roll back to the driver that did the job.
If you're running a Windows platform, then be aware that Windows Update these days will try to deploy driver updates automatically, and that can actually screw things up and result in driver version mismatches and all kinds of shite.
You might want to disable that. https://www.howtogeek.com/302595/how-to-stop-windows-10-from-automatically-updating-hardware-drivers/
You may also then want to go into Device Manager and forcibly uninstall the driver for your card first.
Then reboot your system and reinstall your preferred driver, which you should download from the AMD website.
Though, that said, "NXT is virtually unplayable for me" leaves a lot to the imagination, so you might want to share some further detail first and see if there's a problem unrelated to your driver causing the issue first...