excel.exe is not terminating from task manager

[Inthi]

Hi,
I am using VC++ for Excel Automation using Type library Excel9.olb
My problem is,I am openning an Large Excel file (about 4000 rows and 150
columns of data) using CWorkbooks -> Open then I am closing the work book
using
Close and release dispatch then I am using CApplication -> Quit and Release
dispatch to quit the excel application, still the excel.exe will be running
in the task manager.
If I try to Open a small file say about 5 rows and 10 columns it is closing
successfully.
I also tried the application running it in the foreground by using
CApplication -> put_visble(true) the application will close but still I find
excel.exe running in the task manager.

OpenSourceExcelFile(CString &strSource)
{
BOOL bRet=TRUE;
CApplication oExcel=NULL;
CWorkbooks oBooks=NULL;
LPDISPATCH lpDisp=NULL;

COleVariant covOptional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);

oExcel.CreateDispatch(_T("Excel.Application"));
oExcel.put_UserControl(FALSE);

oBooks.AttachDispatch(oExcel.get_Workbooks());
//--------------------------------------------------------------
//Open the Source Excel File and get the Data

lpDisp=oBooks.Open(strSource,\
covOptional, covOptional, covOptional, covOptional,\
covOptional, covOptional, covOptional, covOptional,\
covOptional, covOptional, covOptional, covOptional);

ASSERT(lpDisp);



...........................
....................
.....................

oBooks.Close();
oBooks.ReleaseDispatch();

oExcel.Quit();
oExcel.ReleaseDispatch();
oExcel=NULL;

}


Can you please provide a solution for my problem
In Anticipation of your reply..



Regards,
Inthiqab