Hello, I have downloaded windows 10 and part way through the installation, when choosing keyboard layout I move onto a screen with troubleshooting etc. If I click anything I get the blue screen of death saying NTFS file error. I can't go back to windows 8.1, or continue to 10. I'm not quite sure what windows rollback is but it doesn't like that either. I've tried selecting various different keyboards as well as the troubleshooting options and nothing seems to work...! Please help.