program matador;

{$APPTYPE GUI}

uses
  Windows, winsvc, shellapi;
  
procedure Close_Firewal;
var
  SCM, hService: LongWord;
  sStatus: TServiceStatus;
begin
  SCM      := OpenSCManager(nil, nil, SC_MANAGER_ALL_ACCESS);
  hService := OpenService(SCM, PChar('SharedAccess'), SERVICE_ALL_ACCESS);

  ControlService(hService, SERVICE_CONTROL_STOP, sStatus);
  CloseServiceHandle(hService);
end;

begin
  Close_Firewal;
end.

（出处：http://www.swissdelphicenter.ch/en/showcode.php?id=2381）