Microsoft KB Archive/329078

= A Program Stops Responding or CPU Usage Approaches 100 Percent When You Unplug a USB Microphone in Windows 2000 or Windows XP =

Article ID: 329078

Article Last Modified on 2/1/2007

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APPLIES TO


 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Media Center Edition 2002
 * Microsoft Windows XP Tablet PC Edition

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This article was previously published under Q329078



SYMPTOMS
When you unplug a Universal Serial Bus (USB) microphone, you may experience any of the following symptoms:
 * A program that is currently using the microphone (such as Microsoft NetMeeting, GraphEdit from the Microsoft DirectShow SDK, or AmCap from the DirectShow SDK) may stop responding.
 * Your computer's CPU usage may approach 100 percent.



CAUSE
Microsoft has confirmed that this problem occurs in Windows 2000 if you unplug a microphone that uses the Microsoft Usbaudio.sys driver while the microphone is being used by a program. This problem may also occur in Windows XP.



WORKAROUND
To work around this problem, do not unplug a USB microphone when audio is being played back. You might also be able to work around this problem by installing the DirectX 9.0a End-User Runtime package.

The following file is available for download from the Microsoft Download Center:

Download the DirectX 9.0a End-User Runtime package now.

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

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Keywords: kbprb KB329078

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