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You receive a "Windows was unable to install the modem" error message when you try to install a modem on your Windows XP Service Pack 2-based computer
Article ID: 883356 - View products that this article applies to.
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows Registry
When you try to install a serial modem or a universal serial bus (USB) modem on your Microsoft Windows XP Service Pack 2 (SP2)-based computer, you may receive the following error message:
Windows was unable to install the modem.
This problem occurs if there are no entries under the following Windows registry subkey:
This problem may occur after you remove third-party modem software from your computer.
To resolve this problem, repopulate the subkey with the correct entries and values, as follows.
Entry Name: ErrorControl
Entry Name: Group
Value: Extended base
Entry Name: Start
Entry Name: Tag
Entry Name: Type
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To add these entries to the subkey, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 883356 - Last Review: November 10, 2004 - Revision: 3.2