Look at the results with https://www.google.com/search?q=Windows+7+did+not+support+a2dp
You find your post as well as http://social.technet.microsoft.com/Forums/en-US/w7itprohardware/thread/add8dea3-695e-48c4-8459-cbdb6ec23311/
So it seems that Windows 7 could support it if YOU figured out the drivers and profile.
I read that Windows 7 did not support a2dp bluetooth, and I'm wondering if the issue is resolved? Thanks in advance.