I recently upgraded to Windows 8.1 from my Windows 8 version I have been using since it was released. The upgrade from store worked pretty well. I was worried about the software, files and profile settings during this transition, but all worked well at the end. All my installed software works fine, no files seems missing and profiles settings are the same. So I am happy to upgrade from Win 8 to Win 8.1. I am using Samsung SSD 840 PRO (MZ-7PD256BW) on my desktop and you know SSD are costly and will have less disk space then your normal HD offers. This means I am very skeptical about each file I have in my system drive. After upgrade I found huge increase in disk space usage. I tried to find out who was eating my disk space and I found two new folder in system drive. $Windows. » Read more