I'd just uninstall Driver Sweeper, and install the new version of it. It's a lot simpler. Takes me 2 mins when I update it.
Just as a side note to the main topic of this thread. You can go into safe mode, uninstall the Nvidia driver and software before using Driver Sweeper. That should eliminate a few steps in the MP's summary of steps. The reason why you kinda need to be in safe mode when uninstalling the old driver is because you still have Nvidia files/processes in use.