Hmm not really sure what you have been doing.
You had a database, and there was data in it? (ie. users, forums, posts, etc...)
You tried to repair the database but it failed at the first attempt? If it fails, you should try to run it a few more times. If needed first close the forum.
Then you tried to run install again? And choose to delete exisiting tables? If so, your entire database is removed.
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