Hi
sounds like a corrupt user file!
Have you tried to log in as another user or get some one else to log in and see if that works.
If the other person can log in then your user profile is corrupt. you can create another user profile and then assign your files to that user.
This advice i got from a friend who uses the ACT contacts database ver 6.
Better yet go to the person in your company that gave you the program to work with and ask for help.
Regards
Mike