Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I recently tried to reformat one of the partitions in my dual boot PC. I originally had XP and then installed 7 as a dual boot. Well, long story short, XP was having problems, so I reformatted the XP partition and lost my ability to dual boot.

I first tried EasyBCD, to fix the problem, but this made things worse. Upon restart I could no longer even load XP. Thus, I deleted the XP partition entirely in hopes to just have the Windows 7 partition and be able to boot.

Of course, this failed too and left me only able to boot from CD.

Is there any way I can fix this problem? I have tried commands in the command prompt off the 7 cd. I tried bootrec /rebuildbcd and got an "element not found" error. I then tried to make the partition active by using diskpart, but it give me a "the specified partition type is not valid for this operation" error.

Given CarpeNoctem's answer below I did bootsect /nt60 ALL. This completed successfully, but I'm still getting:

Verifying DMI Pool Data ......

I tried bootrec /fixmbr and a reboot, but still the same error. I've tried to erase the BCD files but it says access is denied on D: (my second partition) and it says it cannot find the specified file in C: (my erased partition). Next I did bootrec /rebuildbcd again, and it identified 1 Windows installation, C:\Windows, just like bootrec /scanos reports.

That's where I'm at.

share|improve this question

migrated from Feb 16 '10 at 6:51

This question came from our site for system and network administrators.

If you changed the numbers of partitions, Windows won't work any more, since it uses partition numbers internally.

But since you are on Windows 7, see this article - How to Run a Startup Repair in Windows 7:

Startup Repair is a Windows 7 system recovery tool that can fix certain problems, such as missing or damaged system files (ex: MBR boot file), that might prevent Windows from starting correctly. This will show you how to run Startup Repair to allow it to scan your Windows 7 computer for a startup problem and try to fix it so your computer can start correctly.

share|improve this answer

Boot off a windows 7 disk and select "Repair your computer" then choose "command prompt". Now cd into the boot dir and run:

bootsect /nt60 ALL

Report back.

share|improve this answer
Thank you for the help. I did that and my bootcode was successfully updated on all target volumes. How should I proceed from here? Sorry. I'm not great with command prompt. – Travis Feb 16 '10 at 4:09
Since there's no additional OSes installed at this time then there's no reason to manually edit the BCD or anything like that. How do you fair on reboot? – CarpeNoctem Feb 16 '10 at 4:23
I still get the stupid Verifying DMI Pool Data ...... Boot from CD/DVD: DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER – Travis Feb 16 '10 at 4:26
Sounds like the MBR might have been borked somehow. The bootsect is probably good so let's try "bootrec /fixmbr" and a reboot. If that doesn't work then the BCD is next. – CarpeNoctem Feb 16 '10 at 4:32
I did it and it completed successfully. But I'm still getting that lovely BOOT DISK FAILURE error. Thanks so much for helping me. – Travis Feb 16 '10 at 4:39

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.