Playback has Droputs

iTunes running on my HP laptop with an Intel i7-720QM Quad Core processor, 4 GB memory Windows 7 -64 ultimate cannot simultaneous play music with webcam capture and output to a receiver and TV via HDMI.
Note: iTunes playing:
- without webcam and HDMI works fine
- with webcam alone sound is scratchy with clicks
- with webcam and HDMI sound has many dropouts
Microsoft Media Player does not have these issues. Any suggestions how to set up iTunes to eliminate this problem or is this because of how Apple implemented iTunes?

Red, yellow, and green render bars and what they mean
http://blogs.adobe.com/premierepro/2011/02/red-yellow-and-green-render-bars.html

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