Just install and run GWX Control Panel.
http://ultimateoutsider.com/downloads/
There are many reasons that some people may not want to upgrade: I have a client that uses Windows 7 machines as public status displays. The last thing they need is a change of operating system. Especially to one that is desperately trying to pretend it's a mobile device.
They don't need:
Adverts popping up to tell them to upgrade to the latest version of Office
Weather reports
News Feeds
Updates that appear at inconvenient times