How to Fix a 'Boot Configuration Data File is Missing' Error in Windows 10

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You have Windows 10 on your laptop. It was there yesterday. But now, when you turn on your computer, you're greeted with error code 0xc0000034, "The Boot Configuration Data file is missing."  

The good news is that your data isn't lost, and you can get it all back (we'll show you how). The bad news is that you'll have to do a little work to restore that missing file. Here's how to fix a 'configuration data file' boot error in Windows 1o:

First, you'll need a DVD or USB stick containing Windows installation media. You can download a utility from Microsoft here that will create that for you. Next, follow these steps:

1. Insert your installation media into the computer.

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2. Boot to the media. We had to press F12 during bootup on the Dell we fixed up to reach this menu, though these keys can differ depending on your laptop's make and model.

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3. Click Next on the Windows Setup menu.

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4. Click "Repair your computer."

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5. Choose Troubleshoot.

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6. Select "Advanced options."

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7. Pick "Command Prompt."

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8. Type Bootrec /fixmbr and press the enter key.

9. Type Bootrec /fixboot and press the enter key.

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10. Type Bootrec /scanos and press the enter key.

11. Type Bootrec /rebuildbcd and press the enter key.

12. Type "A" to add the installation to the boot list and hit enter.

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13. Exit the command prompt with the X button on the top of the window.

14. Click "Continue" to go to your desktop.

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Author Bio
Andrew E. Freedman
Andrew E. Freedman,
Andrew joined Laptopmag.com in 2015, reviewing computers and keeping up with the latest news. He holds a M.S. in Journalism (Digital Media) from Columbia University. A lover of all things gaming and tech, his previous work has shown up in Kotaku, PCMag and Complex, among others. Follow him on Twitter @FreedmanAE.
Andrew E. Freedman, on
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69 comments
  • samuel Says:

    Thank you! I have an exam today and my pc ran into this problem yesterday night. I was so sure that the data was gone. But then, I found you.
    I followed the steps you listed and successfully got it running back in good health.
    Thanks a lot , dude !!
    I'm forever indebted to you. :)

  • cplus cplus s/w engineer Says:

    Thanks so much, the instructions were easy to follow and spot on. The longest part was the building of the bootable usb drive.

  • Sara G Says:

    Followed every step and it was repaired in under 30 minutes. Thank you!

  • Harsha Vardhan Reddy A Says:

    Thank you bro. now I can reboot into my windows 10.

  • Father Hobbit Says:

    My Hpx2 went to the advance troubleshhot and was able to follow the Command prompt sequence to fix the issue with a corrupted BCD. Many Thanks for the advice listed.

  • Brian Rizky Bimantara Says:

    Thank you very much dude ! You save my laptop :)). God Bless You

  • Abhinav Anand Says:

    I cant find the screen which asks if you want to repair the system.
    It takes me straight to recovery manager.

  • Madhav Says:

    Seriously!!! You just saved me man!! I got 8TB of data here and you just saved it with a few lines😁😁 Thank you so much Andrew...

  • Some person Says:

    Jesus Christ, Thank YOU, you are so helpful, thank the gods people like u exist :D My Lenovo had this problem and i freaked out so much, well, i hope this would work but thank you thank you thank you

  • Omar R Says:

    Hi, peace :)

    Dear respected Andrew E. Freedman, thank you so much.
    It worked.

  • anders Says:

    The last rebuildbcd did not work I pressed A, but just got an error that the requested system device couldn't be found

  • Alba B Says:

    I also needed to boot it from an USB (wich took 2 hours to prepare!) but then it worked like a charm. Thank you very mucha, I still can't believe that no data was lost!

  • Charlene Banks Says:

    I ran into trouble at the last part, where you type "A". The error said "cannot create an entry that already exists". So I had to type "N" first, which must have deleted the entry, then I ran the command and entered "A", now my computer starts.

    THANKS A MILLION!!

  • Liza M Says:

    you just saved my day..thank you so much! XD

  • Davidos Says:

    Thank you so much. Got this problem after doing Win10 Creator update. You saved my day

  • Mohit Maan Says:

    wow.. u just saved my day.. it worked.. thanks a lot

  • Shlomo Says:

    Wow...It worked for my Windows 10 home edition. Thanks a ton.....

  • Scraprok Says:

    Worked perfectly. I used the usb instead of a disk. It takes a little bit of time for the Windows tool to make the files so be patient. I'd like to send a huge thank you to Mr.Freedman, without you I would have lost almost fifteen years worth of family photos and videos of my kids growing up. You saved me from catching a beating from the wife so today sir, you are my hero.

  • mharvic Says:

    Wow it works!!! Thank u very much.. I fallow all the instraction and that was easy and detailed.. thanks a lot.. 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

  • Vishnu Kumar Says:

    Thanks but here I am stuck. Clean Install windows 10 from bootable DVD.

    while running bootrec /rebuildBCD

    the request could not be performed because of an I/O device error."

  • Marco Says:

    Thanks for this article! It saved my marriage :) My wifes computer is working again :)

  • Daniël Says:

    Just like some other comments here I get the same "A device attached to the system is not functioning" Message here after completing step 12.. Any suggestions?

  • Michael Says:

    Hi,
    After choosing 'A' for ALL after last command, I get "The requested system device cannot be found" instead of "The operation completed successfully". This is while using an ISO download on USB to boot in Win 10. Any suggestions? Microsoft and Lenovo have not been too helpful.

  • Ray G. Says:

    Worked on my older HP laptop with Windows 10. Thanks for the info. Saved me a lot of time reinstalling my programs. Thanks again!

  • Elisha Garma Says:

    I got it until the last command where you need to press A but it says "The Requested System Device Cannot be found"

  • Carlo Says:

    THANK YOU GUYS! It was perfect. Solved the problem :) You made my day :) Still thanks

  • Vanessa B. Says:

    Can you use an SD card in stead cuz I don't have access to another computer?

  • tom roberson Says:

    "no bootable device' so much for this company, two computers in one year, both windows 10, both nothing but paperweights.. but never buying another HP product.. ever !

  • Levi H. Says:

    Customer support said we'd actually need to pay someone to come out and do this, but we used this and did it for free. Thanks!

  • Frank M. Says:

    You save my life, Many thanks.

  • javed Says:

    That worked in Windows 8.1 pro

    Many thanks for uploading exact images cheers

  • Fatih Says:

    Dear Andrew,
    I need help. I followed all the steps until it says add installation to boot list. I click A and the message was A device attached to the system is not functioning. Any idea how to resolve this problem

  • Laura B. Says:

    I'm helping a friend over the phone with this issue. We have burned the ISO to a CD and it will not read. We burned the ISO to a USB and it will not read. We burned the ISO to a CF card and it will not read. We have changed all of the boot setting to match and we cannot get this to read at all. The boot utility is "CMOS Setup Utility." Any ideas?

  • AnnaB Says:

    I don't know how to thank you. I really was upset that I would have to go to my local best buy to recover my data for $200+. This was of great help and actually worked. I only just bought my Lenovo Yoga 710 like 4 months ago. So thank you again.

  • Mendy Says:

    Thank you!
    Worked perfectly on my HP-2000 notebook.

  • Adrian Says:

    Another solution is enter on the BIOS Setup and change in the order boot "Legacy Support" for "UEFI", and disabled the Security Boot, Save Changes and Exit. I had a problem whit dualboot kali linux and windows 10. This worked for me.

  • alexis Says:

    It all worked perfectly until I went to command promt and wrote bootrec /fixmbr it says file not found.

  • Denicco Says:

    I followed all the steps until it says add installation to boot list. I click A and the message was, "A device attached to the system is not functioning." Any idea how to resolve this problem?

  • Macman Says:

    Thanks so much. This worked perfect. No idea how this happened. Guessing a windows update did it.

  • Michel Says:

    Thank you so much!
    I have been working on that for hours! You truly helped me even if I have far because I leave in the Carribean.
    Sincerly grateful.

  • lerhoem Says:

    Hi! I did everything that you described, but my pc does not show the option: repair your computer, just install now. what can i do? Thank you!

  • Ahasn U. Says:

    some time it problem if the driver does not match and here

  • Anthony E. Says:

    Thank you so much!!!!! I have had my yoga 2 11 for a while now. I was deleting bloatware when this error occurred. Thank you so much for your help. It worked perfectly.

  • JoMan Says:

    Thanks a lot!
    You saved my first day with my new computer! :)

  • Jeronimo Says:

    I want to say thanks for the steps to fix the issue I just barely got my laptop yesterday and I was really scared when I saw the error

  • Rajat Says:

    After doing all the steps I am not getting that continue to desktop option.What am I doing wrong??

  • Feynman Says:

    Dear Andrew,
    I need help. I followed all the steps until it says add installation to boot list. I click A and the message was A device attached to the system is not functioning. Any idea how to resolve this problem

  • Abhishek G.Nichal Says:

    Thank you very much for your tips regarding BCD problem while startup it saved my lot of time.

  • Fubar Says:

    UNBELIEVABLE! Thank you so much for these nuggets of knowledge! My laptop was literally FUBARED and I couldn't find anything to help assist the error I was getting. Came across this and you were spot on,good stuff bro. I was almost ready to toss the laptop! Thanks again!

  • leo T Says:

    I too am getting "The requested system device cannot be found". after the last command prompt. As it is an update from a previous version, i do not have the disc to reinstall.

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