I have a group of users that are using MS Access 2003 on XP machines and their login credentials suddenly do not work and the form does not respond at all. The only thing that has happened since the problem since the last time the did work was a Windows 7/Access 2007 machine was introduced to the mix but that macine was never able to log in and tried to run a report upon invoking Access. But that is a related but separate issue as my 2003 users are the ones that keep the daily transactions. I have a group of users that are using MS Access 2003 on XP machines and their login credentials suddenly do not work and the form does not respond at all.