Here's how to do it in EXCEL - really simple How to Read Barcodes in Excel | eHow.com
I actually don't like ACCESS - it's a HORRIBLE limited not very robust data base system -- if you need a proper database system use something like MySQL instead.
Anyway once you've got the Bar code into your EXCEL spread sheet it should be easy importing that into your application.
However if you want to use ACCESS also easy How to Read Barcode Data Into MS Access Databases | eHow.com
"You pays your money and you takes your choice".