Try SqlServerCE 2.0 or 3.0! any one of those. it is very easy to deploy and mantain rather than MS Access Database on Pocket PC and PDA,EDAs etc. Couple of years ago, I tried MS Access but i faced so many problems in my program. so I preferred SQLSERVER Compact Edition. builtin with VS 2005.
Just add a reference System.Data.SqlServerCe in you application and Enjoy the DBMS.