Hi, I am trying to upgrade from Win8 pro to Win8.1. I cannot open the Windows Store in order to get the upgrade. I have searched several forums etc and cannot find a simple fix to enable windows store. i7-3770K, 16GB memory, 64 bit , GeForce GTX 660. Two questions: 1. Is is essential to open Windows Store in order to upgrade 2. If it is essential how can I achieve this (when I start Windows store a page starts the says "Loading Store..." then after around 45seconds a message pops up saying "We weren't able to connect to the store.... Please wait a few minutes and try again."