Just seen a new icon on my task bar so thought would see what it was for..
seems its for windows 10 (4 white squares) some win 7 and 8.1 versions can be updated to 10 for free!!!
more info here I shall post the whole link in case you think its a spoof
http://www.microsoft.com/en-gb/windows/windows-10-faq?ocid=win10_auxapp_context

thought would pass info on, better back up in case it updates automatically without agreeing.
oh the joys of technology.
Regards P