No, websockets is only natively supported by Windows in Windows 8, regardless of which visual studio version you are using.
http://www.paulbatum.com/2011/09/getting-started-with-websockets-in.html
This is due to some low level issues in Windows 7 with http.sys.
There’s an offchance it may be backported, but seems unlikely: http://weblogs.asp.net/owscott/archive/2012/03/01/what-s-new-in-iis-8.aspx
To use websockets on Windows 7, you’ll have to write your own service.
Try using this for clientside: http://websocket4net.codeplex.com/
and this for server side: http://superwebsocket.codeplex.com/