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When building a Web application in Manager or Visual Studio using the Web ADF for the Microsoft .NET Framework on a 64-bit operating system, the following error message may occur:
"Unable to retrieve ArcGIS install directory from registry."
The Web ADF for the Microsoft .NET Framework is unable to find the correct registry values, because it requires an application pool that is running in 32-bit mode and not 64-bit mode.
Run Manager and any Web applications that contain the Web ADF controls in an application pool that supports 32-bit applications.
To enable support for 32-bit applications, toggle the appropriate property of the application pool. The property can be toggled on an existing application pool or a new application pool can be created specifically for Manager and any Web applications that are created.
Modifying an existing application pool to support 32-bit applications could potentially impact other Web applications running in that application pool.
If Visual Studio is being used to create Web applications with the Web ADF, ensure that the Web applications also use an application pool that supports 32-bit applications.