I just made a clean install of Windows 8.1 Pro with Media Center (for the second time) and this problem persists. Now I'm doing 'sfc /verifyonly', but I'm not very confident, since it didn't found anything the first time too. EDIT: sfc returned 0 errors Is there a way to check if the content of the dvd I used is all right? (with Nero I already used the option to verify the write session) In Event Viewer I read this error: 0x80070005