How fast did you burn the iso XJ? Also does the rest of the install seem ok? I only ask as I know from personal experience that if the iso isn't burnt correctly or the download wasn't a clean one then problems like the one you posted about can become apparent. What about Metro icons, are they working ok?
I think I might reinstall, but I would download the ISO file again, check the Sha 1 Hash to ensure a good download (Hash Tab works by installing, then check file properties, you will now see a tab for Sha 1 Hash), burn to DVD with a maximum 4X burn (the native Win 7 and Win 8 OS burner does a great job of this), reboot to the DVD and Clean Install for the best installation.