USB Headset Troubleshooting: Audio Issues on a Windows 7 PC
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I have no audio or intermittent audio issues when using a Plantronics USB headset on a Windows 7 PC. What can I do?
Windows 7 SP1 has numerous fixes for USB audio issues, and it should be installed first. Also, the following Windows 7 USB audio-related hotfixes should then be installed if they aren't already present:
http://support.microsoft.com/kb/981214/ en-us - There is high CPU usage when using a Full speed USB audio device connected to a USB 2.0 EHCI host controller. When the CPU reaches 100%, it can cause intermittent loss of audio, clicks and crackle sound.