Узнаём Установленную Версию Ado

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Узнаём установленную версию ADO

function GetADOVersion: Double;
var
  ADO: OLEVariant;
begin
  try
    ADO    := CreateOLEObject('adodb.connection');
    Result := StrToFloat(ADO.Version);
    ADO    := Null;
  except
    Result := 0.0;
  end;
end;
// To use this function try something like:
procedure TForm1.Button1Click(Sender: TObject);
const
  ADOVersionNeeded = 2.5;
begin
  if GetADOVersion then
    ShowMessage('Need to install MDAC version 2.7')
  else
    ShowMessage(Format('ADO Version %n, is OK', [GetADOVersion]));
end;