Display data in record order.

I've updated from Office Pro for XP to Office 2007, opened my old database and saved in new format.
Records saved as 'Ref' which is the primary key. When opening a form in 2002 to display data, the first record displayed was 1 followed by 2 etc. Buttons would select 'First' Last' 'Next' 'Previous.'
In 2007 the same happens, except if a new record is created and the form opened, that new record is displayed first, not record 1.
So, in Access 2002 if records were numbered 1 to 20 they would be displayed automatically 1, 2, 3 etc., but now with say 2 new records created i.e. 1 - 22
the display order is 21, 22, 1, 2, 3 etc.
How do I rectify this to display records in Ref order 1 to 22?
Hope someone can help. Regards - John