You cannot have both the 32- and 64-bit versions of the same provider installed at the same time.
#Microsoft access database engine 2007 for windows 7 64 bit install#
If you have the 32-bit version of 2010 or 2016 installed, you need to uninstall it and download and install the 64-bit version instead. If you have the 2007 32-bit version installed, you can simply install the 64-bit version alongside it. First, you can install the 2010 or 2-16 64-bit version. If it doesn't exist, you get the error message that brought you here. When a call is made to the ACE provider, the 64 bit process will attempt to locate a 64-bit DLL. 64-bit processes cannot load 32-bit DLLs. By default, IIS on a 64-bit operating system will run applications in a 64-bit worker process. If you get this error when trying to use ACE from an ASP.NET application, the most likely cause is that you have installed either one of the 32-bit versions. You need to be careful which option you choose, because a wrong choice here is the most frequent cause for the error message. The 2007 version is only available as a 32-bit component whereas the 20 versions offer both 32 and 64-bit options. The ACE provider is available in three forms: Microsoft Office Access database engine 2007, the Microsoft Access Database Engine 2010 Redistributable and the 2016 Distributable.
The ACE provider is not installed on Windows operating systems by default. First, I will dispense with the most obvious reason for the error, and that is that the provider hasn't been registered on the machine on which the application is running.
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