Excel Can't quit?

[sflau]

I am using VB 6.0 to control Excel for to do some thing, and then save as a new file. But I find that the excel application is still holding the excel, although I already quit it. Would anyone help me, please? Here is my coding:
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Dim DNxlApp As Excel.Application

Set DNxlApp = New Excel.Application
DNxlApp.Visible = True
DNxlApp.Workbooks.Add
...
DNxlApp.ActiveWorkbook.SaveAs FileName:="C:\XXXXX.xls", FileFormat:=xlNormal

DNxlApp.Workbooks.Close
DNxlApp.Quit
Set DNxlApp = Nothing
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But after I set the Excel Application as nothing, the application until existing, unless I quit the VB program.