I suppose this was posted after reading
the pinned thread here about 'Current Issues' that I updated the other day? I fixed the forum's post counts for you just now and as for restoring from backup the April 1st backups would not be usable, the one from march 20th however might have helped. But I would guess too much time has passed for you to want to use that far back of a backup.
If you can leave links to where these threads are posted by 'guests' BbBoy can remove them for you. If it is just one forum that happened in a link to that would probably be enough for BbBoy to find all the corrupted threads that are on the board. If you are having other problems leave details and we can see what we can do.