Could not open table 'MSysAccounts' in the workgroup information file. (Error 3173)

This operation requires the System.mdw file, which contains the security and option settings for Microsoft Jet database tables.

Possible causes:

• The SystemDB value of the \HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Access\Jet\4.0\Engines\Jet key in the Microsoftｮ Windowsｮ Registry points to a network drive that is not connected. Make sure the network drive is available, and then try the operation again.
• The System.mdw file is corrupted. If you have a backup copy of System.mdw, copy it to the location specified in the SystemDB entry in the Registry.