You receive a "RUNDLL Error loading irprops.cpl" error message when you start Windows XP (834340)


The information in this article applies to:

  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition


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:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When you start a computer that runs Microsoft Windows XP Professional or Windows XP Home Edition, you may receive the following error message:
RUNDLL
Error loading irprops.cpl.
The specified module could not be found.

CAUSE

This problem may occur if any of the following conditions are true:
  • The Bluetooth Authentication agent is installed in your computer, but a DLL file is missing.
  • The Bluetooth Authentication agent was removed from your computer, but its registry value still exists in the registry.

RESOLUTION

To resolve this problem, use the following methods in the order that they are presented.

Remove the Bluetooth Authentication agent

To remove the Bluetooth Authentication agent, follow these steps:
  1. Click Start, point to Settings, click Control Panel, and then double-click Add/Remove Programs.
  2. On the Install/Uninstall tab, click Bluetooth Authentication Agent, and then click Add/Remove.
  3. Restart the computer

Delete the BluetoothAuthenticationAgent entry from the Windows registry

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.

If the Bluetooth Authentication Agent was removed from the computer, follow these steps to delete the BluetoothAuthenticationAgent entry from the Windows registry. To do so, follow these steps:
  1. Click Start, click Run, type regedit in the Open box, and then click OK
  2. Locate and then click the following registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  3. In the right pane, right-click BluetoothAuthenticationAgent, and then click Delete.
  4. Click Close to close Registry Editor.
  5. Restart the computer.
Modification Type:MajorLast Reviewed:2/9/2004
Keywords:kbprb KB834340 kbAudEndUser
©2004 Microsoft Corporation. All rights reserved.