* Boot failure: This occurs when Windows is unable to start up properly.
* Boot loop: This occurs when Windows restarts itself repeatedly without being able to start up properly.
* Missing or corrupt boot files: This can occur if the boot files are damaged or missing.
* MBR (Master Boot Record) corruption: This can occur if the MBR, which is the first sector of the hard drive, is damaged.
The /FixBoot command is used to repair the boot sector and make Windows bootable again. It does this by writing a new boot sector to the hard drive.
The /FixMbr command is used to repair the MBR and make Windows bootable again. It does this by writing a new MBR to the hard drive.
The /ScanOs command is used to scan the hard drive for Windows installations and display a list of the found installations.
The /RebuildBcd command is used to rebuild the boot configuration data (BCD), which is the file that contains the boot menu options. It does this by scanning the hard drive for Windows installations and adding them to the BCD.
The /Bootcfg command is used to create or modify the boot configuration (boot.ini) file, which is used by older versions of Windows to control the boot process.
The bootrec.exe tool can be used from the Windows Recovery Environment (WinRE) or from a command prompt. To use bootrec.exe from WinRE, follow these steps:
1. Start your computer and press the key that is displayed on the screen to enter WinRE.
2. Click Troubleshoot > Advanced options.
3. Click Command Prompt.
4. Type the following command and press Enter:
bootrec.exe /FixBoot
If you are unable to access WinRE, you can also use bootrec.exe from a command prompt. To do this, follow these steps:
1. Insert the Windows installation DVD or USB drive into your computer and start your computer.
2. Press any key when prompted to boot from the DVD or USB drive.
3. Select your language and keyboard layout, and then click Next.
4. Click Repair your computer.
5. Click Troubleshoot > Advanced options.
6. Click Command Prompt.
7. Type the following command and press Enter:
bootrec.exe /FixBoot
Once the bootrec.exe tool has completed its task, you can restart your computer and try to start Windows.