Do you also still have an Inbox.dbx along with the Inbox (1).dbx, or just the one?
I'm still looking through Google about this, but here's something you could try.
First off, do some backing up first so nothing important is lost forever. A lot of this backing up is redundant, but we want plenty of options left to try.
1. Go into your identity and copy the whole darned OE Identity folder into My Documents.
C:\Documents and Settings\YourName\Local Settings\Application Data\Identities
(You probably only need the folder containing your dbx files, but we're playing it safe.)
2. Create a "Backup" folder in OE and move the emails from your Inbox to that folder.
2a. Optional. You didn't say exactly how DBXtract failed to help you. But if you doubt it recovered a usable backup of your emails, here is another program (free) that I saw mentioned on several forums.
Outlook Express Extraction (scroll down a bit to find it)http://macallan.club.fr/index.htm
Unfortunately I haven't found any description of what it looks like, what it actually does, or how to actually use it. But no one said it did any harm. Your choice.
2. Empty your recycle bin. This is just to make it easy to find anything you might need to restore.
3. Make a System Restore Point
Now try deleting the Inbox.dbx (if you have that too) and Inbox (1).dbx again. (I'm assuming you already knew that OE should be closed when doing this?)
Restart OE to recreate the new Inbox.dbx. Is your Inbox empty or are your emails back in there too?
If your Inbox is now empty, then move your emails from the Backup Folder into the new Inbox.
Close OE. Open it again and see if everything still okay.
Now go back to your Identity just to make sure OE did not create another (1).dbx after doing that. If it did create a (1) also, try deleting it. Open OE again to see if your message are still there. If not, restore it back from the recycle bin.
(If you keep ending up with two Inboxes again and that's the only way you can see your emails, it probably means that the Folders.dbx is corrupted. There's more on that if we have to deal with that instead.)