To start Windows Vista or Windows 7, you get the BOOTMGR is missing type errors or An error occured while attempting to read the boot configuration date and you are unable to access your session?
Don't panic! With the repair tools included in the Windows Vista or Windows 7 installation DVD, you can recreate damaged Windows startup files and look for a functional computer.

Configure the boot order
You must change your computer's startup sequence to start first on the Windows DVD and not on your hard disk. This operation is done in the BIOS.

  1. To start your computer, press the delete key to enter the bios. Following motherboards, this can be the F1 or F2key. Feel free to refer to messages displayed on the screen and in the documentation for your computer.
  2. Open the Startup tab.
  3. Select the boot device priority option and press enter.
  4. Select the first line 1st boot device and press enter.
  5. In the list that appears, select your CD-ROM drive and press ENTER.
  6. Then press F10 and save changes by OK.

Run auto repair
The Windows disk includes tools to analyze and repair automatically when Windows starts. Here is how to run this repair.

  1. Insert your Windows DVD into your drive and restart your computer.
  2. Press a key when you are prompted.
  3. Choose the language, time and the keyboard type and click Next.
  4. Click repair your computer.
  5. In the window that appears, choose your system restore and click Next.
  6. If a message you warned that Windows found problems. Click repair and restart , and then repeat the steps in this page.
  7. Click on Startup Repair.
  8. Windows startup is then repaired. Click Finish.
  9. Your computer is restarted. Windows should now function normally. If this is not the case, go to the next step.

Use the BootRec tool
If the previous steps failed to repair the Windows startup, you can use the BootRec tool that will allow you to recover files from a damaged hard disk boot structures.

  1. As in the previous step, insert your Windows DVD into your drive and start over. Follow the same procedure to the System Recovery Options window.
  2. Click on the command prompt.
  3. In the window that opens, enter the bootrec/rebuildbcd command and press the enter key.
  4. After a few seconds, a message indicating that the operation succeeded. If BootRec cannot locate damaged files, go to the next step.

Recreate the startup data
If BootRec cannot locate damaged files, you must delete and re-create all files related to the startup configuration.

  1. In the command prompt window, type the bcdedit/export C:\BCD_Backup and press enter.
  2. Then enter the command c: and press enter.
  3. Enter the command cd boot and press enter.
  4. Type the command attrib bcd s h r and press enter.
  5. Enter the command ren bcd bcd.old and press enter.
  6. Finally enter bootrec/rebuildbcd command and press enter to reconstruct the files related to the startup configuration.
  7. Press the o button to retrieve your Windows installation.
  8. Finally click on the restart button.

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Last edited: 2012-11-04

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