What if the boot manager is lost

If the boot manager bootmgr in the root directory of the C drive is damaged or lost, the system will prompt to find the operating system when starting the computer. The ntldr file similar to Windows 2000/XP is missing.
Under Windows 2000/XP, to solve this kind of failure, you first need to know that the cause of the failure is that the boot manager is lost, then enter the recovery console, and use the expand command at the command prompt to solve the copy of the ntldr file in the installation CD. Compress to the root directory of the C drive.
In Windows Vista, it's very simple. We don't need to know what is causing the system to fail to start. Just follow the steps below:
(1) First use Windows Vista to refuse the strike series 1 - Sesame opens Introduce the method, use the Windows Vista installation CD to boot the system into the "System Recovery Options" and click on "Start Repair".
(2) The system searches for the cause of the startup failure in order according to the set order. In the background of the system, the startup recovery checker will automatically test and analyze Windows updates (if the patch fails, it may also cause startup failure), system disk, disk error, disk metadata, target operating system, startup log and so on.
(3) If the system finds the cause of the startup failure and repairs it, it will enter a dialog box prompting that it has found and tried to fix the problem.
(4) Windows Vista does not display the cause of the fault by default. Click the “Complete” button to restart the computer to complete the recovery.
If you need to see the cause of the failure, you can click on "Click here for details on diagnosis and repair" on this dialog box. On the dialog that opens, we can see that the root cause was that <;the boot manager" was lost, and the required file repair tool has been successfully completed.