For me I suspect the problem was actually the new Catalyst program (now ADM Vision), the gpu control panel. For me, and I reproduced the problem a second time before I got the message, I lost the ability to connect to wi-fi. The wi-fi still worked, and it did so until my computer was restarted. After that, it didn't work again until I completed a system restore to go back to my old driver and Catalyst program.
If Nvidea says you don't need to do that, then you're probably fine. AMD says to just uninstall everything first, and that's what made it work for me, but admittedly, I am really only familiar with AMD.
To directly answer the rest of your question, system restore makes copies of all the system settings, which include the drivers. It should always be able to revert if you have driver errors, or a piece of maleware starts mucking around in your operating system.