Is it possible to "re-start" my forum but keep certain data?

[Munch98]

I have disabled every single modifications I have ever installed but honestly mate I get random errors everywhere, I'm far from good in this field so it's completely unreadable by me.

I need to somehow start over in a clean forum but still have the users, posts and categories ect.

--------------- Added [DATE]1338129246[/DATE] at [TIME]1338129246[/TIME] ---------------

Bump

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Well crap, turns out the problem is a lot worse than I thought. A lot of my forum actually simply isn't functioning.

I'm willing to pay if I find someone who is willing to teach me or do it themselfs, I need a fresh forum installed (I can do that) and then my users, forum threads ect imported.