The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine

In my case the server hosting the web application was IIS 7.5, and this application was trying to collect some data from excel spreadsheet, but there was an exception message:
The 'Microsoft.Jet.OLEDB.4.0' provider is not registered on the local machine.
In order to fix this error I have opened advanced setting of the IIS application pool of affected web application and changed the property of "Enable 32-bit Applications" to True.


 After changing this property, problem has been successfully solved.

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