Arunsule,
In the query that you have defined, make sure that you sort the query by the Autonumber field that you have added to the table; ie. ensure that this field is included in the query, and select the "Ascending" option from the pulldown list of that column in the Sort: row of the query grid.
At the moment it sounds like you are not providing any sorting criteria associated with the query.
Cheers,
Steve.