I did today an update from 8 Core to 8.1. I couldn't update through Store because there is no Windows 8.1 Update there. So, I downloaded 8.1 DVD ISO and put on stick. Then run setup.exe and it went well without any error. After restart I got this screen: i.imgur.com/rYEZXN8.png Everything else works, just some options in Control Panel are messed. I tried to do a refresh, keeping settings and data, then put USB and it restarted telling that there is nothing to do. I can restore back to 8, but I would like to fix this if possible. Please help. Thanks in advance.