Unable to establish connection to database.

• Error information:
  Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
  [Microsoft][ODBC Microsoft Access Driver] The Microsoft Jet database engine cannot open the file '(unknown)'. It is already opened exclusively by another user, or you need permission to view its data.
• Other possible cause of this problem:
  The database cannot be opened, most likely due to incorrect connection settings or insufficient security set on your database folder or file.
  For more details please refer to http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306518