I forgot to switch to a different kernel when I did the above test (like I said, I'm a computer incompetent).
So, when I gave the command to reinstall the kernel, it gave me the message that the driver was already installed (from the auto-update script). So, I take it that it should've worked (except for my incompetence).
Then, I checked and found that there was a newer driver available from NVIDIA. I tried my best to uninstall the old driver. When I went to install the updated driver... I got several dozens of errors. I just kept hitting "OK". In the end, it appears that it did install and is working correctly. WOO HOO!
I've now updated the symbolic link and placed the updated driver in usr/src. I figure that is enough for today. I'll wait for the next kernel update, to make sure it works.