How to fix BOOTMGR is missing error without a Windows disk
You will still need a boot CD/DVD or USB drive, but not with the operating system distribution. You should place some recovery image on that drive, Hiren’s Boot CD for example. The images of these disks are available on most torrents and include a set of tools that allow correcting some windows issues including bootmgr is missing error.
Here is the list of software you can fix “BOOTMGR is missing” error with
Acronis Disk Director
Acronis Recovery Expert
Hello nam nguyen.
Acronis recommends fixing BOOTMGR the following way described in the respective KB article.
Acronis Recovery Expert is a tool in Acronis Disk Director 12.5 that allows recovering deleted, lost and damaged volumes. If the machine fails to boot (e.g. after a power outage or a system error) use the bootable version of Acronis Disk Director and run Acronis Recovery Expert. It will help you to recover boot sectors and partition tables on hard disks and make your system bootable again.
There is also Acronis Disk Editor tool in Acronis Disk Director 12.5 which allows performing a variety of actions on a hard disk: you can restore boot records, repair files and folder structure, find lost clusters, remove computer virus code from a disk and much more.