I (nervously) edited the registry per the link. PC booted fine but with error msg on desktop "windows version may not be genuine, click here" Led me to Microsoft website, where for nearly 3hrs it stayed with a spinning circle "validating windows". Gave me a "restore previous session" which led me to the page (youtube video) my daughter was watching when it locked up initially. Ran avast and Malwarebytes scans - ok. On next reboot "Restart and select proper boot device or insert boot media" Could not get into setup , safemode, anything. Opened up case, unplugged , cleaned and reseated HD, PS, etc connections. On reboot was able to get F9 (HP diagnostic tools). CPU and RAM passed, HD error BIOHD-2. From my initial research I gather my HD is toast. Any thoughts or magic out there ? Thx.