Could Not Quit MSACCESS.EXE

I am trying to create MS access file (.mdb) from the data set with the following code. Every thing is working fine. But I found the MSACCESS.EXE is still running in the Task Manager. When ever I run this program new MSACCESS.EXE is added to task manager.

I could not kill the process after I created the file. I tried all the possible ways and checked with user forums, news group and MSDN, but no luck.

Access.Application accessData;
accessData = new Access.ApplicationClass();
accessData.NewCurrentDatabase("C:TestTest.mdb");
accessData.ImportXML("C:TestTest.xml",Access.AcImportXMLOption.acStructureAndData);

// Quit Access and clean up.
accessData.CloseCurrentDatabase();
accessData.Quit(Access.AcQuitOption.acQuitSaveNone );
Marshal.ReleaseComObject(accessData);
accessData = null;