C#NET2008 problem with Microsoft WORD 2003

Question

Hullo my Good Friends,
I need your help again. Please help me.
I am trying to use C#NET2008 and Microsoft WORD 2003 to develop Window Application  to print the Sales Transaction statement. But it not working.
This coding create the error message list below

 objWord = new Microsoft.Office.Interop.Word.Words();  <--- Error

 

Error Message:

Error 1 Cannot create an instance of the abstract class or interface 'Microsoft.Office.Interop.Word.Words'

 

Here are the coding:

 
using Microsoft.Office.Core;
using Microsoft.Office;
using Microsoft.Office.Interop.Word;
 
namespace CSharpDelegatePractice
{
    public partial class FrmCustomerMaint : Form
    {
          private Microsoft.Office.Interop.Word.Words  objWord;
          private Microsoft.Office.Interop.Word.Document  objDoc;
 
      private void WordToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string strsql = "Select * from TblSales where SalesID = " + txtSalesID
            objWord = new Microsoft.Office.Interop.Word.Words();  <--- Error
            objDoc = new Microsoft.Office.Interop.Word.Document();
        }
   }
}      
 

 
Please help me. Thank You.
Cheers,
Lennie