I am a traditionalist and so run permanently in "desktop" mode because I don't like the look and feel of the new Windows 8. Ever since I installed Windows 8.1 a blank green Microsoft "Store" window pops up from time to time on my desktop. When I click on it, the green is replaced by a normal Store page advertising trending apps, etc. This unwanted Store pop-up seems to appear at random intervals and is a real nuisance. I certainly never expected to get unwanted advertising pop-ups from a company like Microsoft! Can anyone please tell me how to get rid of this annoying intrusion?