Check and make sure it is trying to read the correct database. If the path is correct and the database files are there, you're screwed (probably). At that point, you could try deleting the VISTA.TAF and LOCKMGR.DBL files from the database directory and see if that will let you back in.
Check and make sure it is trying to read the correct database. If the path is correct and the database files are there, you're screwed (probably). At that point, you could try deleting the VISTA.TAF and LOCKMGR.DBL files from the database directory and see if that will let you back in.