How to generate word document in windows server 2003?

I had written a function to generate a word document by using the Office Interop Word object. My code is as shown below. It is working fine in my local system. But when i try to run it from window server 2003 it is not working. It keeps loading at Word.Document wordDoc = wordApp.Documents.Open and doesn't do anything.

private?void?GenerateEmploymentCertificate()
     {
         object?Nothing?=?System.Reflection.Missing.Value;
         object?format?=?Word.WdSaveFormat.wdFormatDocument;
         Word.Application?wordApp?=?new?Word.ApplicationClass();
 
         object?srcFileName?=?Server.MapPath(ResolveUrl(@"~/HRLetter\Arabia\Templates\Employment?Certificate.doc"));
         Word.Document?wordDoc?=?wordApp.Documents.Open
        (ref?srcFileName,?ref?format,?ref?Nothing,?ref?Nothing,
        ref?Nothing,?ref?Nothing,?ref?Nothing,?ref?Nothing,?ref?Nothing,
        ref?Nothing,?ref?Nothing,?ref?Nothing,?ref?Nothing,?ref?Nothing,
        ref?Nothing,?ref?Nothing);
         try
         {
 
             object?bookmarkDate?=?"Date";
             wordDoc.Bookmarks.get_Item(ref?bookmarkDate).Select();
             wordApp.Selection.Text?=?string.Format("{0:MM/dd/yyyy}",?lblRequestdate.Text);
 
             object?bookmarkEmployeeName?=?"EmployeeName";
             wordDoc.Bookmarks.get_Item(ref?bookmarkEmployeeName).Select();
             wordApp.Selection.Text?=?lblEmployeeName1.Text;
 
             object?bookmarkCompany?=?"Company";
             wordDoc.Bookmarks.get_Item(ref?bookmarkCompany).Select();
             wordApp.Selection.Text?=?lblCompanyName1.Text;
 
             object?bookmarkJoiningDate?=?"JoiningDate";
             wordDoc.Bookmarks.get_Item(ref?bookmarkJoiningDate).Select();
             wordApp.Selection.Text?=?string.Format("{0:MM/dd/yyyy}",?lblJoiningDate1.Text);
 
             object?bookmarkDesignation?=?"Designation";
             wordDoc.Bookmarks.get_Item(ref?bookmarkDesignation).Select();
             wordApp.Selection.Text?=?lblDesignation1.Text;
 
             string?DocName;
             DocName?=?string.Format("{0}_employment_certificate",?lblRequestNo.Text);
             hFilename.Value?=?DocName;
             wordDoc.SaveAs(Server.MapPath(ResolveUrl(@"~/HRLetter\Arabia\Letters\"?+?DocName?+?".doc")));
 
         }
         catch?(Exception?exp)
         {
             Session["generalError"]?=?null;
             Session["generalError"]?=?"There?was?an?error?at?generating?the?letter.?Please?send?email?to?unify.admin@unilever.com?with?this?screen?shot.<br?/><br?/><br?/>Request?No:"?+?lblRequestNo.Text?+?"<br?/>Action:Submit<br?/>"?+?exp.StackTrace.ToString();
             LogManager?logHelper?=?new?LogManager(Request.PhysicalApplicationPath.Trim(),?"Leave?System?-?Malaysia");
             logHelper.LogError("[btnSubmit_Click?-?]"?+?exp.Message?+?".StackTrace?-?"?+?exp.StackTrace.ToString());
             Response.Redirect(ResolveUrl("~/Error/ErrorHandler.aspx"));
         }
         finally
         {
             //?Close?wordDoc2
             wordDoc.Close(ref?Nothing,?ref?Nothing,?ref?Nothing);
             if?(wordDoc?!=?null)
             {
                 System.Runtime.InteropServices.Marshal.ReleaseComObject(wordDoc);
                 wordDoc?=?null;
             }
             //?close?wordApp
             wordApp.Quit(ref?Nothing,?ref?Nothing,?ref?Nothing);
             if?(wordApp?!=?null)
             {
                 System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp);
                 wordApp?=?null;
             }
         }
         GC.Collect();
     }
 

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