Este é um bug com a seguinte atualização:
Uma atualização da pilha de serviços está disponível para o Windows RT e Windows 8: junho de 2013 link
Known issues The following known issues may occur after you install update 2821895:
When you use the System File Checker tool to run the following command, you may receive an error message that states that there are corrupted files. The error message also states that you must restart the computer to repair the files. sfc /scannow To work around this issue, use the DISM tool to repair Windows. After you repair Windows, run the System File Checker tool again. If you still receive an error message that states that there are corrupted files, your system may contain corrupted files. In this situation, contact technical support for more help.
Execute este comando DISM para corrigir o problema:
Dism /Online /Cleanup-Image /RestoreHealth
O Verificador de arquivos do sistema encontra arquivos corrompidos após a instalação do KB2821895