Herkunftssprache: Englisch
The problem with Access is it is a flat desktop file and not really up to the demands of the backend of a forum unless you only have a handful of users.
This is why it does warn you of this on the download page and recommends you to run the mySQL or SQL Server version.
If you are unable to repair the database you may have to start again with a clean database, if this is the case use one of other versions with a more robust database server backend