Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

uses
 BDE;

 function CheckBDEInstalled: Boolean;
 begin
 Result := (dbiInit(nil) = DBIERR_NONE)
 end;

 procedure TForm1.Button1Click(Sender: TObject);
 begin
 if CheckBDEInstalled then
 ShowMessage('BDE is installed.')
 else
 ShowMessage('BDE is not installed.')
 end;