access is denied in sharepoint document library event handler word

[hareesh]

am opening wordapplication object (Have a reference to Microsfot Interop
assembly) on the server side in sharepoint document library even handler.

I am getting "access is denied" exception. The user is "SPSUser"
Can somebody please help me to overcome this exception.

My code : (getting expception when creating wordapplicaiton )

void IListEventSink. OnEvent(Microso ft.SharePoint.S PListEvent listEvent)
{
IntPtr tokenHandler =
System.Security .Principal.Wind owsIdentity.Get Current().Token ;
WindowsIdentity objWindowsIdent ity = new WindowsIdentity (tokenHandler);
CloseHandle(tok enHandler);

WindowsImperson ationContext objWindowsImper sonationContext =
objWindowsIdent ity.Impersonate ();

try
{
if (listEvent.Type == SPListEventType .Insert)
{
SPWeb site = listEvent.Site. OpenWeb();
SPFile file = site.GetFile(li stEvent.UrlAfte r);
string fileName = file.Name;
int length = fileName.Length ;
string fileExtension = fileName.Substr ing(length-3);
if(fileExtensio n.Equals("doc") )
{
wordApplication = new ApplicationClas s();
..
..
.. .
..
.. objWordFormExtr act.FileName = file.Url;
objWordFormExtr act.LoadMyScena rioRecord(ref objScenarioReco rd);
if (objScenarioRec ord != null)
{
if(objScenarioR ecord.StoreReco rdInDataBase())
{ errorMessage = "Document is uploaded successfully"; }
}
else
{ errorMessage = objInfoPathForm Extract.ErrorMe ssage; }
}
}

}