By Ivy / Last update April 28, 2018

Still unable to boot Windows 7 after running Startup Repair

“I failed to boot my Dell laptop running Windows 7 this morning. Then I decided to use Startup Repair to repair Windows 7 not booting problem. However, Startup Repair is unable to solve this problem with the message “Startup repair cannot repair this computer automatically”. I’m in a mess. Is there anyone can help me to fix computer not booting issue? Thanks a lot.”

Fix Windows 7 boot failure using Bootrec commands

Startup Repair is helpful if your Windows is unable to boot. It can scan your computer and fix corrupted system to repair Windows. But there are chances that you’ll encounter the situation mentioned above or Startup Repair stuck (Startup Repair loop) out of various causes. In such circumstance, it is advised to use Command Prompt to fix issues with your boot records. First of all, you can access Command Prompt by following the steps given below:

1. Boot form Windows Installation media.

2. In the initial Windows installation screen, click “Repair your computer”.

3. Choose your operating system and click “Next”.

4. In the System Recovery Options window, click “Command Prompt”.

Now, you can fix issues with your boot records using Command Prompt.

Bootrec /fixmbr

Master Boot Record (MBR) belonging to boot record, which contains the disk signature, partition table for the drive and a small amount of executable code for the boot start. When it is damaged or corrupted, you may not be allowed to boot system and receive error messages like Operating System not found, Invalid Partition Table or Operating System not found.

To fix damaged MBR, in Command Prompt window, input “Bootrec /fixmbr” and hit “Enter” key. This command can write a new Windows-compatible MBR based on the version of your windows to the boot sector and it will not overwrite the existing partition table.

Bootrec /fixboot

Boot sector is a small section located at the beginning of a hard drive, which hosts MRB and holds some code and data that can help BIOS hand off the startup process to Windows.

To repair boot sector, you can run “bootrec /fixboot” command. This command will try to write a new boot sector on the hard disk if Windows detects damage.

Bootrec /rebuildbcd

The Boot Configuration Data (BCD) contains boot information and partition parameters. If there is something wrong with the BCD file, you might fail to boot Windows and receive error message like Boot Manager is missing. At this time, in Command Prompt, you can type “bootrec /rebuildbcd” and press “Enter” key.

Alternative way to fix boot records using Command Prompt

When Command Prompt can’t fix issues with your boot records and you are still unable to boot Windows, it is a nice choice to perform a system restore. Here I suggest you to try a third party backup and restore freeware – AOMEI Backupper to help you restore your system to earlier status when you are unable to boot your computer. It is able to work with Windows 7/8/10, XP and Vista. Let’s see how it works, supposed that you have created a system backup via AOMEI Backupper. Well, a bootable CD/DVD or USB created by AOMEI Backupper is necessary.

Step 1. Boot your computer with the bootable media you created by AOMEI Backupper.

PS.: For different computer models, the key can be different. In usual, Del key is for desktops and F2 for laptops.

Step 2. Here you’ll enter the main interface of AOMEI Backupper. Under “Restore” tab, select a task to browse an image. Then, click on “Next” button.

Restore System AOMEI Backupper

PS.: If the backup that you need to restore is not presented, click “Path” to browse the image file that you want to restore.

Step 3. Choose a backup point to restore. Tick the box before "Restore system to other location" if necessary. Then, click "Next".

Select A Backup Point to Restore

Step 4. Here you can see an operation summary. Click “Start Restore” to perform the restore operation.

Operation Summary


It is a good idea to use Command Prompt to fix issues with your boot records when you are unable to boot computer and Startup Repair not working. But in order to better protect your computer, it is advised to apply AOMEI Backupper to backup Windows 7/10 in advance, thus you can restore it if necessary. Surprisingly, AOMEI Backupper offers you flexible backup schedules: Daily, Weekly, Monthly, Event Trigger and Real-time Sync. But if you want to use Event Trigger mode or Real-time Sync mode, you need to upgrade AOEMI Backupper to Professional Version. Apart from system backup and creating bootable media, AOMEI Backupper is featured with many other functions. For example, it can clone hard drive to SSD, thus you can replace HDD with SSD without reinstalling.