I bought this machine in January of this year and it is still under guarantee. Until recently it has behaved perfectly under Wondows 8.1. About three weeks or a month ago it suddenly decided that Windows Live Mail 2012 and Google Chrome were not worthy to contact the net. My curiousity made me try some of the apps on the "Start" page, eg News/Weather/Ebay all of which were accessing the web and working well. I also sent an email through the "Mail" app, using Gmail which arrived successfully. So the fault would seem to be from Windows.
Both the Web Browser and Live Mail say that the computer is not connected to the net, but the computer itself tells me that it is connected via my woreless router, which my experiments above would seem to validate.
I tried "System Restore" which would not work. Until that time I had allowed Windows Update free access, but have now altered my policy.
All advice welcome - HELP (please?)