My brothers PC is running Windows 10. Recently he has run into a problem where his screen blacks out and his PC reboots, usually a minute or so after he logs in (it doesn't physically turn off though). When it's finished rebooting, he'll usually either be brought to the automatic repair screen or back to the login screen, and sometimes he receives an error message, one which said that the kernel was compromised, or something along those lines, and Windows needed to be reinstalled. We tried to reinstall Windows through automatic repair, removing any form of existing storage, and the reinstall would start for a minute, and then get rejected. I'm almost certain that he has a virus, but I just want to make sure before taking further action