Your broadband connection that you have detailed uses a software that allows you to connect and disconnet your internet connection. This utility override window's build-in software. With w7, it's very automated and you just have the icon as show in Orbital's post. You can disconnect and connect using the buton as shown.
Your broadband utility that you use in Xp, if you are able to install it, this might also override (or even co-exist) with w7's wireless function.
If this post was a day earlier i would have tested my Huawei broadband and can confirm.