Hello again.
I have run scannow, and it came back with no errors - or whatever it says like that. I have attempted to get things going with the ethernet disconnected, and it didn't work.
I agree that it seems the driver is the problem. Specifically, it is not installing properly; I have tried different versions of that driver, and a whole other adapter driver. So, it's not the driver itself.
Somewhere during this process, I attempted to install the driver in safemode. I got an error something like, "Windows Installer error... see documentation...." etc. I remembered problems with this service from my XP days. So, I went into services and it was stopped. I attempted to restart it, and it wouldn't. So, I went to the Windows help page and downloaded a Windows Installer fix app. I ran it and started the service. Since then, Windows Installer has stopped again, and again. I have not attempted to reinstall the driver from safemode, anticipating the same problem. I guess I should anyway.
Could this all be related to Windows Installer? I have all Windows updates. Now that I think about it, I haven't attempted to install anything in the mean time, either. I don't know anything about this service, other than it used to fail in XP. The only reason I wonder is because of the error I got in safemode; it must have been trying to work or I wouldn't have gotten the error.
So, I'm going to post this, then reboot in safemode with networking, after I uninstall the adapter, and see what happens.
I'll be back.