How to Fix/Repair the Windows 7 Bootloader problems (Guide)


20.10.2010

How to Fix/Repair the Windows 7 Bootloader problems (Guide)

The Windows 7 Bootloader can sometimes cause irritating problems, due to very small causes, like installing an older operating system ( XP, Vista ) on a PC that already has Windows 7 installed. This causes the Bootloader to disappear ( gone for a smoke ) and the Windows not to start. Other similar issues may occur due to mistakes on installing the OS, hardware faults or others. These cause Bootloader errors, like the missing bootmgr file.

Before we start this, if you try to start the PC and can’t boot the Windows, try starting it in Safe Mode. If this is successful, restore it to a previous date.

There are several methods to repair the Windows 7 Bootloader problems. We will speak today about booting from the Windows’s installation disk and then repairing the master boot record, replacing the Windows XP Bootloader with Windows 7, in case you installed it, or use the start up repair method. Let’s start with the first:

Windows 7 mini logo

Boot from the Windows Install Disc
  1. Insert the Windows 7 installation disk into your DVD-ROM and turn on the PC. Make sure you have chosen the DVD-ROM as your primary boot option ( this can be changed from your bios, under startup, default boot options ).

  2. Now press a key to enable the booting procedure and click “Next” until a “Repair your computer” link appears on the bottom of the page. It should look like bellow:

    Step 2

  3. Choose “”Windows 7” from the next window and check the first radio button:

    Step 3

  4. This will make the PC go to the System Recovery Options, where you will have to click on “Command Prompt”.

  5. Now we will repair the master boot record. All you have to do is choose from the following commands, and type one into the Command Prompt box.

  • bootrec /fixmbr – simply restores the master boot record.

  • bootrec /fixboot – same as above, plus it adds a new boot sector onto the system partition. We recommend this because it’s more useful.

  • If you want to go rogue for a second, type bootrec /? to see all the available options.

    All available options

Replace the Windows XP Bootloader with the one from Windows 7

This method can be used if you installed Windows XP by mistake on a computer that had already Windows 7 on it. This makes the last one to lose its Bootloader, thus leaving without the tool to revive itself.

  1. Do the same as above to get access on the Command Prompt.

  2. Simply type “bootsect /nt60 all” to restore the Windows 7 Bootloader. You may replace the “all” word with the drive letter ( C, D, E ), on which the OS has been installed, because sometimes the “all” command does not work.

    Success

    Using the Automated Startup Repair Method
    1. Follow the first 3 steps from method 1, to reach the system recovery options.

    2. Click on the “Startup Repair”, to make the disk check for problems and hopefully, fix them. If unlucky, use the command prompt method above.

      Recovery

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