An introduction to computer audio
Computer audio does have its problems now and then.
A couple of Win7 troubleshooting tips can be found here.
Play back being interrupted (dropouts) is a common complain.
Streaming audio is a matter of two devices communicating over a network.
It takes 3 to tango to work properly.
In 2010 Microsoft moved to new forum software.
Also new is the participation of the MS helpdesk.
They are very good in copy/pasting KB articles for you.
Hopefully the one they copy/paste is related to your question.