How to resolve the issue related to excel while reading data from a PDF file via C#?

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Windows

C#4.0

service

How to resolve the issue related to Excel while reading data from a PDF file via C#?
I am extracting the data from a PDF file and exporting the same to Excel sheet via a windows service. But on doing the same below issue is seen:
RETRIEVING THE COM CLASS FACTORY FOR COMPONENT WITH CLSID {00024500-0000-0000-C000-000000000046} FAILED DUE TO THE FOLLOWING ERROR: 80070005 ACCESS IS DENIED.

What I have tried:

The core code of extracting data from PDF File is as below:

#region GetFillData
      //Copy the Standard Excel Template to DATA folder fetching PDF Data/Move PDF from the File Store to DONE Folder afterwards at last
      private void GetFillData(string SourcePDFFullPath)
      {

          WriteServiceLog("" + SmartPDFLogCaption + "Entered " + MethodInfo.GetCurrentMethod().Name + " Method");
          try
          {

              //Delimiter with which data is fetched from SMART PDF (split with '|')
              Char delimiter1 = '|';
              //Delimiter with which data is fetched from SMART PDF (split with '~' after spliting with '|')
              Char delimiter2 = '~';

              //Pass the PDF File in the FileStore
              PdfReader pdfReader = new PdfReader(SourcePDFFullPath);
              AcroFields pdfFormFields = pdfReader.AcroFields;
              string PDFFileName = Path.GetFileName(SourcePDFFullPath);
              //Get Template Id from Hidden Field(Template ID set Statically) in SMART PDF
              string TemplateID = pdfFormFields.GetField("hidTemplateId");
              //Get PDF Data in control fields from Hidden  Field(PDF) in SMART PDF
              string CapturedPDFValues = pdfFormFields.GetField("hidPDFDataExport");
              string[] PDFValues = CapturedPDFValues.Split(delimiter1);

              //Fetch Unique No(Quotation No) from PDF
              string UniqueNo = PDFValues[0].Substring(PDFValues[0].LastIndexOf(delimiter2) + 1);
              //Set Current Date while rernaming Excel Template in DATA Folder (ddmmyyyy format)configured in APP.Config
              string CurrentDate = DateTime.Now.ToString("" + FileRenameDateFormat + "");


              //Validate If the Template Id is empty for the PDF Files in FileStore Folder
              if (TemplateID == "")
              {
                  WriteServiceLog("" + SmartPDFLogCaption + "" + TemplateIdValidationMsg1 + "" + SourcePDFFullPath + MethodInfo.GetCurrentMethod().Name + " Method");
                  return;

              }
              //Capture PDF Data If the Template Id Exists for the PDF File in FileStore Folder
              else
              {
                  //Validate Excel Template  exists in the Template Folder
                  string ExcelTemplateFullPath = string.Empty;
                  string ExcelExtension = string.Empty;
                  //Save the Excel Template with data in the Destination Excel Folder(DATA Folder in FileStore) with UniqueNo+Currentdate(ddmmyyyy format)
                  string DestinationFullPathExcel = string.Empty;
                  if (File.Exists(ExcelTemplatePath+TemplateNamingStart+TemplateID+".xls"))
                  {
                      ExcelExtension = ".xls";
                      ExcelTemplateFullPath = ExcelTemplatePath + TemplateNamingStart + TemplateID + ExcelExtension;
                      DestinationFullPathExcel = DestinationExcelPath + TemplateNamingStart + TemplateID + "_" + UniqueNo + CurrentDate + ExcelExtension;

                  }
                  else if (File.Exists(ExcelTemplatePath + TemplateNamingStart + TemplateID + ".xlsx"))
                  {
                      ExcelExtension = ".xlsx";
                      ExcelTemplateFullPath = ExcelTemplatePath + TemplateNamingStart + TemplateID + ExcelExtension;
                      DestinationFullPathExcel = DestinationExcelPath + TemplateNamingStart + TemplateID + "_" + UniqueNo + CurrentDate + ExcelExtension;

                  }
                  else
                  {

                      WriteServiceLog("" + SmartPDFLogCaption + "Template Id:" + TemplateNamingStart + TemplateID + " doesn't exists in the Template Folder" + MethodInfo.GetCurrentMethod().Name + " Method");
                      return;
                  }
                     //Capture PDF Data If Template Id Exists for the Excel Template in Template Folder
                          //Set the   Excel App object and with avoidance of Excel alerts
                          _Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                          xlApp.DisplayAlerts = false;
                          //fetch the Quotation No after Splitting pdf data
                          object misValue = System.Reflection.Missing.Value;
                          _Workbook xlWorkBook = xlApp.Workbooks.Add(misValue);
                          //read the Standard Excel Template fILE(Path Included)(Renamed) set in the Template Folder configured in App.Config
                          xlWorkBook = xlApp.Workbooks.Open(ExcelTemplateFullPath, 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
                          _Worksheet xlWorkSheet = (_Worksheet)xlWorkBook.Worksheets.get_Item(1);
                          //Setting all PDF DATA/Values fetched to the Std Excel Template moved to the DATA Folder
                          for (int i = 0; i < PDFValues.Length; i++)
                          {
                              xlWorkSheet.Cells[i + 1, 2] = "'" + PDFValues[i].Substring(PDFValues[i].LastIndexOf(delimiter2) + 1);

                          }
                          //Format A1:D1 as bold, vertical alignment = center.
                          //xlWorkSheet.get_Range("A1", "D1").Font.Bold = true;
                          //Excel saved with data from PDF File to DATA Folder
                          xlWorkBook.SaveAs(DestinationFullPathExcel, XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, false, Type.Missing, XlSaveAsAccessMode.xlShared, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                          //Move the PDF from File Store Folder to the DONE Folder
                          //Fetch the Destination PDF Path configured in App.Config with file name of the Source PDF File in Filestore Folder
                          string DestinationPDFFullPath = DestinationPDFPath + Path.GetFileName(SourcePDFFullPath);
                          //Delete the PDF if it's already exisitng in the Destination PDF Path
                          if (File.Exists(DestinationPDFFullPath))
                          {
                              File.Delete(DestinationPDFFullPath);

                          }
                          //Move the PDF file from FileStore to Done Folder
                          File.Move(SourcePDFFullPath, DestinationPDFFullPath);
                          //Close the Excel App and Release Excel Object
                          xlWorkBook.Close(true, misValue, misValue);
                          xlApp.Quit();

                          releaseObject(xlWorkSheet);
                          releaseObject(xlWorkBook);
                          releaseObject(xlApp);



                      //Close the PDF Reader Object
                      pdfReader.Close();


                  }



          }
          catch (Exception ex)
          {
              WriteErrorLog(MethodInfo.GetCurrentMethod().Name + " " + ex.Message, ex.StackTrace, true);
          }
          finally
          {

          }
          WriteServiceLog("" + SmartPDFLogCaption + "Finished " + MethodInfo.GetCurrentMethod().Name + " Method");
      }
      #endregion