Third Party Apps, Add-ins and VBA code. These are developer tools that help in the development of Access databases. These items are generally not for the End User. Some are freeware.
Links to sites with example databases and VBA Code Repositories. You will find lots of useful Visual Basic for Appliations ( VBA ) code to help with building your Microsoft Access Database with Visual Basic for Appliations ( VBA ).
Be sure to make a Backup before attempting any type of recover. This includes running compact and repair.
If you do suspect you have any database issues the first thing you should do is exit the database and make a backup.
These are links about the built-in User Level Security (ULS) for the JET database engine(.mdb format) Access 2000-2003.
Note: This feature has been depreciated and is no longer available in the new ACE database ending (.accdb format) in Access 2007/2010
TIP: Be sure to check out the Access 2007 and Access 2003 sections. A lot of the informtion also applies to Access 2010.