export DataGridView to excel 2007 in c#

[H R]

hi Microsoft.Office.Interop.Excel.ApplicationClass ExcelApp = new Microsoft.Office.Interop.Excel.ApplicationClass(); // in this line of code: ExcelApp.Application.Workbooks.Add(Type.Missing); error: Old format or invalid type library. (Exception from HRESULT: 0x80028018 (TYPE_E_INVDATAREAD)) can any one help me ?

H.R