After rebooting your computer you receive the following error:
Windows Boot ManagerYou may receive a similar error which lists the error code as 0xc0000034 or missing file: \windows\system32\winload.exe instead.
Windows failed to start. A recent hardware or software change might be the cause. To fix the problem:
1.insert windos cd and run a repair your computer option.
Info: an error occurred while attempting to read the boot configuration data.
You may also receive further errors after trying to repair the bcd store using bootrec and bcdedit as follows.
The requested system device cannot be found.Cause and Fix
The “Windows Boot Configuration Data File is Missing Required Information
The “Windows Boot Configuration Data File is Missing
An error occurred while attempting to read the boot configuration data
The most likely cause of this error is that you tried to dual boot two operating systems and then later decided to remove one. This inadvertently may have deleted the bcd boot store. The trick here is to run the above commands in the right order and set your boot partition to active. Let’s get started.
Make sure your boot partition is set to Active
Boot from your DVD and choose the repair option. From the recovery console type “diskpart” and press enter and then type “list disk” to get a list of physical disks installed.
In the example here I only have one disk in my machine, if you have more than one identify the disk which has the Windows boot partition on it and then select it. Select it by typing “select disk 0″ (in my case). Now type “list partition”. The Windows 7 boot partition is a 200 MB primary partition. As you can see here it was on disk 0. Select it by typing “select partition 2″ or whichever number matches your 200MB partition.
Now type “detail partition” and look where it says “Active”. If it says yes then move onto the next section otherwise type “Active” and press enter, Windows should report the partition is now marked as active. Now reboot and boot into the recovery console again.
Repair the MBR and boot sectors
From the recovery console run these commands in this order:
- bootrec /fixmbr
- bootrec /fixboot
If you have any additional operating systems you want to add use the bootrec /scanos command.
If you still have issues you may have a system with a GPT disk. In this case you will have an EFI sytem partition that must always be active. See the following if you get Failure when attempting to copy boot files or suspect you have an EFI system.