Thanks, people...
Ylap: Yes. When I couldn’t download using windowsupdate, I had done it “your way.” But, thanks, anyhow. I might not have thought of it.
Spyros and P3t3rb0nn: The firewall wasn’t the problem, as far as I know, but Active X and Java settings were. I use Notify instead of Automatic Update. I keep Microsoft in my Trusted Sites security zone, and apparently forgot that I had fiddled with the settings. This was the first time I experienced problems since doing it, though. And, yes, I am aware that Microsoft requires Internet Explorer.
However, sometime during my settings changes, I received an error message from windowsupdate, which prevented me from accessing the Install page. I don’t know for sure what I did to get it working properly, but I eventually got there, and was told that no critical updates were available. Very strange. I hope it doesn’t mean I’ve exacerbated the problem. (I deleted all references to the particular file from my computer, and tried again. Same result: No updates available).
So I won’t know if you folks have resolved my problem until the next update notification.
For now, thanks a lot. If there’s a way I can let you know what happens, I’d be happy to do so. Besides, I may have to holler for help, again.
DavidR: Thanks for your input. That’s the file I’m talking about. You’re probably right; it’s not worth bothering with, but I still have to know why I can’t download from windowsupdate.