 Have to fix this error when booting a Windows operating system. There can be several things to cause the trouble. Windows boot sequence can be reset. Other possible causes include damaged boot sector or incorrect work of the hard disk. The first thing to do is to check boot priority in BIOS. Then to BIOS, find the section with the name. Your hard disk should be in the first position. And if it's not there, set the highest priority for the disk with the plus key. Another method. Use Startup Repair. The error screen will give you a choice of advanced recovery options. Another one. The method involves checking the hard disk for errors and correcting them. To do it, open Advanced Options again and select Command Prompt. Type the following command.