It has been a while since I used Access, but I seem to remember that there was an import procedure that would make most of the necessary conversions. It was possible to open a prior version, but you could not make any changes. My practice was to copy my original database in a safe place, then import it into the newer version. If this is what you did, then I have no other suggestion to offer. I would check the Microsoft forums--I don't like to do it, but sometimes you find something useful.
A long shot method may be to download OpenOffice (no charge) and import your original database into that and then see if you can import it into the current Microsoft version. The data should move all right. Some forms and reports that you have created may need some work. Good luck.