It worked! And it also restored the Task Scheduler which I had also lost some time ago, but couldn't figure out how to restore.
I have also reinstalled Sp2 and all the updates.
The only issue that now remains is an intermittent inability to access the internet. I have a DSL connection, and sometimes it connects right up, other times not. This has started just since I did the reinstall, and checking the connection indicates I am connected, but my browser (either IE alone, or in my Juno program) can't find the server. I have the LAN settings at "automatically detect", and it sometimes helps to unplug and replug the wire between my router and CPU, but not always. Also, another computer in the house that uses the DSL via a wireless connection will be working while my machine, connected by wire, doesn't.