How to use Bootrec.exe in the Windows RE to troubleshoot startup issues step by step procedures

Bootrec.exe is a built-in Windows Recovery Environment (Windows RE) tool that can help troubleshoot and fix various startup issues in Windows. Here's a step-by-step guide on how to use Bootrec.exe: ### Step 1: Access Windows Recovery Environment (WinRE) 1. **Force Shutdown**: - If Windows fails to start several times, it may automatically enter the Windows Recovery Environment. If not, you can force it to start by powering on your PC, and as soon as it begins to boot, power it off. Repeat this 2-3 times. 2. **Select Repair Your Computer**: - Once in WinRE, you will see a screen with several options. Choose **"Troubleshoot."** 3. **Go to Advanced Options**: - In the Troubleshoot menu, select **"Advanced options."** 4. **Open Command Prompt**: - From the Advanced options menu, select **"Command Prompt."** ### Step 2: Use Bootrec.exe Commands With the Command Prompt open, you can now use various Bootrec.exe commands to troubleshoot boot issues. #### 1. **Rebuild BCD (Boot Configuration Data)** - Type the following command and press **Enter**: ``` bootrec /rebuildbcd ``` - This command scans for installed operating systems and allows you to add them to the boot configuration data. #### 2. **Fix MBR (Master Boot Record)** - If rebuilding the BCD doesn't resolve the issue, you may need to fix the Master Boot Record. Enter the following command: ``` bootrec /fixmbr ``` - This command writes a new MBR to the system partition, which can resolve boot issues caused by corrupted MBR. #### 3. **Fix Boot Sector** - Sometimes, the boot sector can be corrupted. To update the boot sector on the system partition, type: ``` bootrec /fixboot ``` - Note that you may receive an error stating "Access is denied." If this occurs, certain additional commands may be needed, or further troubleshooting might be required. #### 4. **Additional Commands (if needed)** - If the issue persists, you can also run additional commands to repair disk errors or check the disk integrity: ``` chkdsk C: /f /r ``` - Replace `C:` with the appropriate drive letter if your Windows installation is on a different drive. ### Step 3: Restart Your Computer 1. After running the necessary commands, type `exit` and press **Enter** to close the Command Prompt. 2. Navigate back through the menus and select **"Continue"** to restart your computer. ### Step 4: Check for Resolution - Upon rebooting, check if your system starts normally. If the issue persists, it may be due to other underlying problems or corruption that may need further inspection or advanced recovery options. ### Additional Tips - Ensure you have backups of important files if possible before attempting repair actions. - If you’re not comfortable with these steps or if your PC continues to have startup issues, consider seeking professional assistance or a more comprehensive recovery solution. This process should help you use Bootrec.exe effectively to troubleshoot and potentially fix startup issues in Windows.