Cannot create ActiveX component.pls help

Question

using System;

using System.IO; using System.Drawing; using System.Configuration; using System.Windows.Forms; using System.Runtime.InteropServices; using Microsoft.VisualBasic;

class PDFThumbnailCsharp { [STAThread] static void Main(string[] args) { // Acrobat objects Acrobat.CAcroPDDoc pdfDoc;
Acrobat.CAcroPDPage pdfPage; Acrobat.CAcroRect pdfRect; Acrobat.CAcroPoint pdfPoint;

 AppSettingsReader appSettings = new AppSettingsReader();

 string pdfInputPath = appSettings.GetValue("pdfInputPath", typeof(string)).ToString();
 string pngOutputPath = appSettings.GetValue("pngOutputPath", typeof(string)).ToString();

    string templatePortraitFile = Application.StartupPath + @"\pdftemplate_portrait.gif";
 string templateLandscapeFile = Application.StartupPath + @"\pdftemplate_portrait.gif";;

 try
 {
  // Get list of files to process from the input path
        // Could change to read list from database instead
  string[] files = Directory.GetFiles(pdfInputPath, "*.pdf");

  for (int n=0; n < files.Length; n++)
  {
   string inputFile = files[n].ToString();
   string outputFile = pngOutputPath + files[n].Substring(files[n].LastIndexOf(@"\")+1).Replace(".pdf", ".png");

            /* Could skip if thumbnail already exists in output path
            FileInfo fi = new FileInfo(inputFile);
   if (!fi.Exists) {} */

   // Create the document (Can only create the AcroExch.PDDoc object using late-binding)
   // Note using VisualBasic helper functions, have to add reference to DLL in
   // C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Microsoft.VisualBasic.dll
   // Will always be available as .NET framework ships with all

            pdfDoc = (Acrobat.CAcroPDDoc) Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");
   bool boolret = pdfDoc.Open(inputFile);


            int ret;
            if (boolret == true)
            {
                ret = 1;
            }
            else
            {
                ret = 0;
            }


   if (ret == 0)
   {
    throw new FileNotFoundException();
   }

   // Get the number of pages (to be used later if you wanted to store that information)
   int pageCount = pdfDoc.GetNumPages();

   // Get the first page
   pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(0);

   pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();

   pdfRect = (Acrobat.CAcroRect) Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");

   pdfRect.Left = 0;
   pdfRect.right = pdfPoint.x;
   pdfRect.Top = 0;
   pdfRect.bottom = pdfPoint.y;

   // Render to clipboard, scaled by 100 percent (ie. original size)
            // Even though we want a smaller image, better for us to scale in .NET
            // than Acrobat as it would greek out small text
            // see http://www.adobe.com/support/techdocs/1dd72.htm
   pdfPage.CopyToClipboard(pdfRect, 0, 0, 100);

   IDataObject clipboardData = Clipboard.GetDataObject();

   if (clipboardData.GetDataPresent(DataFormats.Bitmap))
   {
    Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);

    // Size of generated thumbnail in pixels
    int thumbnailWidth = 45;
    int thumbnailHeight = 59;

    string templateFile;

    // Switch between portrait and landscape
    if (pdfPoint.x < pdfPoint.y)
    {
     templateFile = templatePortraitFile;
    }
    else
    {
     templateFile = templateLandscapeFile;
     // Swap width and height (little trick not using third temp variable)
     thumbnailWidth = thumbnailWidth ^ thumbnailHeight;
     thumbnailHeight = thumbnailWidth ^ thumbnailHeight;
     thumbnailWidth = thumbnailWidth ^ thumbnailHeight;
    }

    // Load the template graphic
    Bitmap templateBitmap = new Bitmap(templateFile);

    // Render to small image using the bitmap class
    Image pdfImage = pdfBitmap.GetThumbnailImage(thumbnailWidth, thumbnailHeight,
                null, IntPtr.Zero);

    // Create new blank bitmap (+ 7 for template border)       
    Bitmap thumbnailBitmap = new Bitmap(thumbnailWidth + 7, thumbnailHeight + 7,
             System.Drawing.Imaging.PixelFormat.Format32bppArgb);

    // To overlayout the template with the image, we need to set the transparency
                // http://www.sellsbrothers.com/writing/default.aspx?content=dotnetimagerecoloring.htm
    templateBitmap.MakeTransparent();

    using (Graphics thumbnailGraphics = Graphics.FromImage(thumbnailBitmap))
    {
     // Draw rendered pdf image to new blank bitmap
     thumbnailGraphics.DrawImage(pdfImage, 2, 2, thumbnailWidth, thumbnailHeight);

     // Draw template outline over the bitmap (pdf with show through the transparent area)
     thumbnailGraphics.DrawImage(templateBitmap, 0, 0);

     // Save as .png file
     thumbnailBitmap.Save(outputFile, System.Drawing.Imaging.ImageFormat.Png);

     Console.WriteLine("Generated thumbnail... {0}", outputFile);
    }

    pdfDoc.Close();

    // Not sure how why it is to do this, but Acrobat is not the best behaved COM object
    // see http://blogs.msdn.com/yvesdolc/archive/2004/04/17/115379.aspx
    Marshal.ReleaseComObject(pdfPage);
    Marshal.ReleaseComObject(pdfRect);
    Marshal.ReleaseComObject(pdfDoc);
   }
  }
 }
 catch (System.Exception ex)
 {
  Console.Write(ex.ToString());
 }

}

}