windows窗体应用程序,操作Excel,"无法创建ActiveX组件" 求指点啊指点,该怎么解决

windows窗体应用程序,操作Excel,"无法创建ActiveX组件" 求指点啊指点

VB.NET code

Dim excelApp As Microsoft.Office.Interop.Excel.Application                  
Dim excelWorkbook As Microsoft.Office.Interop.Excel.Workbook '= Nothing
Dim excelSheet As Microsoft.Office.Interop.Excel.Worksheet '= Nothing
'excelApp = CType(CreateObject("Microsoft.Application"), Microsoft.Office.Interop.Excel.Application)
excelApp = CreateObject("Microsoft.Office.Interop.Excel.Application")
excelApp.Visible = True
excelWorkbook = excelApp.Workbooks.Open(OpenFileDialog1.FileName)
excelApp.Workbooks.Add(True)
 excelSheet = excelWorkbook.Worksheets("sheet1")

在CreateObject时出现问题,"无法创建ActiveX组件".MSDN上说是控件没注册,我该怎么查看注没注册?但我的组件服务里有"Microsoft Excel Application".
或者..该怎么解决?
求指点

------解决方案--------------------
把Interop.Excel.dll复制到bin目录下
添加引用“浏览”选中Interop.Excel.dll就表示可以使用这个组件了