The BOOTMGR error could be a fluke. Check your optical drives, USB ports, and floppy drives for media. Often times, the BOOTMGR is Missing error will appear if your PC is trying to boot to a non bootable disc, external drive, or floppy disk. Note If you find that this is the cause of your issue and its happening regularly, you might want to consider changing the boot order in BIOS so the hard drive is listed as the first boot device. Check the boot sequence in BIOS and make sure the correct hard drive or other bootable device is listed first, assuming you have more than one drive. If the wrong drive is listed first, you could see BOOTMGR errors. I know I sort of hit on this in the troubleshooting step above, but I wanted to call out specifically that you might have the wrong hard drive listed, as many BIOSUEFI systems allow you to specify a particular hard drive to be booted from first. Reseat all internal data and power cables. BOOTMGR error messages could be caused by unplugged, loose, or malfunctioning power or controller cables. Try replacing the PATA or SATA cable if you suspect it might be faulty. Perform a Startup Repair of Windows. This type of installation should replace any missing or corrupt files, including BOOTMGR. Even though a Startup Repair is a common solution for BOOTMGR problems, dont worry if it doesnt fix your problem. Just continue troubleshooting something will work. Write a new partition boot sector to the Windows system partition to correct any possible corruption, configuration problem, or other damage. The partition boot sector is an important piece in the boot process, so if theres any issue with it, youll see problems like BOOTMGR is Missing errors. Rebuild the Boot Configuration Data BCD. Similar to the partition boot sector, a corrupted or incorrectly configured BCD could cause BOOTMGR error messages. Important The following troubleshooting steps are much less likely to help fix your BOOTMGR problem. If youve skipped any of the above ideas then you may have overlooked a very likely solution to this problem Check the hard drive and other drive settings in BIOS and ensure they are correct. The BIOS configuration tells the computer how to use a drive, so incorrect settings can cause problems like BOOTMGR errors. Note Theres usually an Auto setting in BIOS for hard disk and optical drive configurations, which is usually a safe bet if youre not sure what to do. Update your motherboards BIOS. An outdated BIOS version can sometimes cause the BOOTMGR is Missing error. Perform a clean installation of Windows. This type of installation will completely remove Windows from your PC and install it again from scratch. While this will almost certainly resolve any BOOTMGR errors, its a time consuming process due to the fact that all of your data must be backed up and then later restored. If you cant gain access to your files to back them up, please understand that you will lose them all if you continue with a clean installation of Windows Replace the hard drive and then install a new copy of Windows. If all else has failed, including the clean installation from the last step, youre most likely facing a hardware issue with your hard drive. Dont Want to Fix This Yourself If not youre interested in fixing this BOOTMGR problem yourself, see How Do I Get My Computer Fixed See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Be sure to let me know what steps youve already taken to resolve the BOOTMGR is missing issue.