Class not registered error when creating Excel workbook in C#

Question

When I try to access an Excel spreadsheet using the following code I get a \"Library not registered\' error when defining the workbook object wrkbuk using C# from Visual Studio

Answer 1

The registry hack described above fixed the same problem for me. The only difference was I had a 1.9 and a 1.7 entry. I deleted the 1.9 key and my problem was fixed.

Other info:

OS: Windows 10

Visual Studio Professional 2015

C# Windows Form Application

This was on my work laptop. We have Office 2010 installed on each workstation.

Some other things I tried that DID NOT WORK were the following:

Repairing MS OFFICE

Reinstalling MS OFFICE

Downloading Microsoft Office 2010: Primary Interop Assemblies from Microsoft.

I also had several versions of the Microsoft.Office.Interop.Excel.dll on my laptop. Deleting previous versions did not fix the problem.

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