It sounds like you've been hit by an out of space condition. The profiles that have become "unregistered" have been corrupted, and are now probably completely gone, i.e. unrecoverable.
Please speak to your host immediately and ask them if the server has experienced an out of space condition in the past few days. As soon as you know that the situation is resolved, you'll need to begin the cleanup and repair process, which we can either do here or via a ticket using the link below.
When this is taken care of, you'll probably want to look at raising the $99 US for a member area renewal so you can upgrade that antique of yours...
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Charles Capps
UBB.classic™ Developer
Having problems? Open up a support ticket!