On a hunch, rather than re-registering all the files, I just plucked out the service names and did a stop/start on each of them. Next I tried the backup and it worked. Having said that, it looks like the regsvr32 portion of this is not required. Also, the stop/start didn't work automatically on all of them. I ran them one at a time and some said they weren't even running. Some also stopped other services. After trying to stop/start them all, I sorted the services by startup type and manually started any that weren't restarted from my stop/start. After I did that, I tried the backup and success.
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