Well, this is a kick in the pants. I went to try your latest suggestions.
Before bringing up SQL Server, I chose to open the browser and point to the
site, which would, of course, throw an error. However, the dang thing
worked! The site came right up, and I was able to do some things which I
know hit the database, such as logging in with the name and password I set
up.
I didn't make any recent changes since last time. However, I did perform a
rare reboot last night. We had thunderstorms, and I chose to power off and
unplug the machine. So I guess those changes you had me make earlier did the
trick, but a reboot, or at least a restart of one of the SQL Server
services, was necessary for those changes to take effect.
At any rate, thanks for your help!