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Editorial Team
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Asked: 2026-05-28T02:42:14+00:00

A Windows 7 (64-bit) system runs the following code under Windows Azure Compute Emulator

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A Windows 7 (64-bit) system runs the following code under Windows Azure Compute Emulator (SDK version 1.5)

Site site = new ServerManager();

which yields the following exception:

Retrieving the COM class factory for component with CLSID {B15183DD-75F9-42DF-8E57-C8B57692F134} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).

The class id mentioned in the message refers to a 32-bit .dll in Program Files (x86). Since the Azure role code is 64-bit this won’t fly.

This behavior was not observed until some Windows updates were rolled in when installing Windows Phone SDK 7.1

How can this problem be best resolved?

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1 Answer

  1. Editorial Team

    The problem was traced to having IIS Express installed on the same machine – uninstalling it restored normal operation.

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