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Problem with Interop.Excel after uninstalling Office 2007 and installing Office 2003

I am developing a VB.Net application with VS 2005 that opens an Excel
workbook and populates the worksheet with data. I started developing the
application with Office 2007 installed on my Vista OS, but after I
discovered that it won't run on a system with Office 2003, I uninstalled
Office 2007 and installed Office 2003. I reset the reference in .Net to the
Microsoft Excel 11.0 Object Library. The application works fine from the
..Net IDE but when I compile and run the .Exe I get the following error
message:

************** Exception Text **************
System.InvalidC astException: Unable to cast COM object of type
'Microsoft.Offi ce.Interop.Exce l.ApplicationCl ass' to interface type
'Microsoft.Offi ce.Interop.Exce l._Application' . This operation failed because
the QueryInterface call on the COM component for the interface with IID
'{000208D5-0000-0000-C000-000000000046}' failed due to the following error:
could not be found. (Exception from HRESULT: 0x80030002
(STG_E_FILENOTF OUND)).
at Microsoft.Offic e.Interop.Excel .ApplicationCla ss.get_Workbook s()
at RunExcel.Form1. btnRunOutsideFo rm_Click(Object sender, EventArgs e) in
D:\FMI\Dev\NetP lay\VS2005\RunE xcel2003\RunExc el\Form1.vb:lin e 22
at System.Windows. Forms.Control.O nClick(EventArg s e)

This did not occur with the original Office 2007 installation. I've tried
running Office repair, uninstalling and reinstalling Excel .Net program
support from the Office installation, but none of this works. The exe works
on my test platform running WinXP and Office 2003 (clean installation where
Office 2007 was never installed).

It makes no difference whether Option Strict is on or off. The code is
simple:

Dim excelApp As Excel.Applicati on = New Excel.Applicati on
MessageBox.Show ("After Dim excelApp As Excel.Applicati on = New
Excel.Applicati on")

Dim Wbk As Excel.Workbook
MessageBox.Show ("After Dim Wbk as Excel.Workbook" )

Wbk = excelApp.Workbo oks.Add()
MessageBox.Show ("After Wbk = excelApp.Workbo oks.Add()")

excelApp.Visibl e = True
MessageBox.Show ("After excelApp.Visibl e = True")

It bombs at Wbk = excelApp.Workbo oks.Add(). I've tried using
ApplicationClas s and CreateObject but none of that works either.

Anyone know how to fix this short of reinstalling the entire operating
system?

Thanks,

Bill
Apr 29 '07 #1
0 4137

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