Windows Vista, Windows 7, 8, and 8.1-all use the new BOOTMGR bootloader. However, it can even be due to a failed attempt at upgrading the operating system. Any failed automatic update installation of Windows can flash error. The BOOTMGR file installed on your computer might get deleted due to viruses and other malware residing in your system. Reason 2: The Bootloader has been previously deleted

if your computer's hard disk gets damaged physically.īoot volume can become corrupted on both NTFS and FAT32 partitions.

unsafe removal of local or external drives.

if there is a sudden power cut or system crash.

The file system present on boot loader can become corrupted:

If boot partition on your Windows PC corrupts, it can cause this error message to flash. Here are the reasons that are responsible for the error 'Boot manager failed to find OS loader'- Reason 1: The boot volume is corrupted This suggests that your desktop's bootloader is either corrupted or missing. The flashing error message tells that Startup Repair is unable to find the correct BOOTMGR bootloader at the expected location. Part 1: Reasons why the Boot Manager fails to find the OS loader?

Part 3: How to recover data from the unbootable computer if the above methods fail?.

Part 2: Ways to Fix Boot Manager Failed to Find OS Loader.

Part 1: Reasons why the Boot Manager fails to find the OS loader?.

Osloader