This is probably a going to sound dumb, but how do you clear all the information from all the table so that it is like a new database. I know you can delete records, but I can't get auto number to reset back to 0.
The method usually recommended is to make a copy the table (structure only), then run an append query to copy all the records from the original to the new table.
Try deleting any relationships which contain the Autonumber field causing the problem. Then delete the Autonumber field from the table in design view. Save your changes, exit the db, then reopen it. View the table in design view, Insert a new row to contain your autonumber field, set its type to number, then set it as the primary key.
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