Some weird problem has ocurred lately. When I search in the Charms bar for "Add Features" and then click on the concerning option that comes up (Add features to Windows 8.1), an "unspecified error" comes up showing a path to the Appdata directory. This problem happened after I added Windows Media Center which was added without any problem. Also, there's a white bank paper icon next to that option in the Charms bar.
I'm running Windows 8.1 x64 Pro with WMC