Microsoft provided us with a solution. First, we had to disable the
multihoming in the PDC and BDC. We didn't need that for them, anyway.
The multihoming we had on our network was so that the backup jobs could
run on an isolated hub, not disturbing client traffic as much. Second,
Microsoft pointed to a KB article and said that we had to stop the
Computer Browser service on all multihomed servers that exist in the
same domain as the PDC. As soon as we did this, the rapid fire Browser
errors in the System Event Log stopped happening. Meanwhile, our Win98
complaints stopped. (Meanwhile, we're going to migrate off the
remaining Win98 systems very, very soon.) So that wrapped it up. Hope
this helps you, everyone!