A full system check, not just a simple scan, resulted in an un-bootable system. I needed to re-install Windows. No external boot was successful, they all hung at POST. After Windows was reinstalled, a corporate account login (for the former system owner?) was required until CTRl-ALT-DEL aborted the login and a new Windows system setup was started. Windows appears to be fully functional.The system was purchased with a gpu for gaming. It was only tested using Minecraft, Java. It was suitable for that task.