If you’re using a Windows computer, there’s a way to stop it from automatically restarting on its own. At the login screen, press Shift+Ctrl+Esc to open Task Manager and then select “More Details. If you are having trouble booting up your Windows computer, it could be because of a corrupt or damaged boot sector or boot file. A boot sector is the first 512 bytes of data on a hard drive. It contains information about how to access the rest of the hard disk and also information about the operating system that is stored on the drive.