Right, so this goes something as follows... I've had my current laptop for some years which came with Win 8.1 already installed, yet yesterday 'Windows 8.1 Pro Build 9600' started showing in the bottom-right corner of the desktop, then a few hours ago just above this I had the message 'Windows needs to be activated'.

Now this message doesn't show, but '
Windows 8.1 Pro Build 9600' still does!! Anyone know what's going on? Is this a virus or something? Help!!