You might not think it’d be helpful, but there’s an intimidating post over at the EasyBCD NeoSmart site which explains how to manually rebuild the Vista bootloader from the ground up in catastrophic situations. Everyone ends up reformatting or reinstalling Windows overtop their existing partition nothing else seems to work. At this point, most every source on the internet comes up a dead end. Sometimes, however, the BCD is totally corrupted and this doesn’t even work. This infection has been covered in other recent blog posts as well. This problem occurs because of some modern rootkits which create a hidden, encrypted partition at the end of the system drive and mark it as Active and Primary (while simultaneously marking the standard boot partition as Inactive). Sometimes it’s as simple as opening up your favorite disk partitioning software and marking the C: partition as ACTIVE, and if there are still problems, subsequently recovering the boot data as I mentioned in the TDL4 post (keep in mind however that the System Managed partition is typically Active normally on a Windows 7 system thanks to the isolated boot partition that it uses). This essentially means that the bootrec command cannot identify your Windows installation, even though the Windows Recovery Environment has no trouble doing so upon starting. Total identified Windows installations: 0 Worse yet, the usual steps to remedy (such as those described in my earlier post about TDL4 and the resulting blue screen) all fall apart when you reach the bootrec /RebuildBCD command, which returns the message: So following the removal of certain rootkits (such as, which is associated with the Windows Recovery rogue), you may find that your Windows boot configuration data has been totally corrupted. Posted in Case Studies, Recovery | Tagged bcd, bcdboot, boot configuration data, boot problems, bootrec, winre | 38 Replies Solution: STOP Error 0x0000007b (0xfffff880009a98e8 0xffffffffc000000d 0x0000000000000000…) If it’s not, it’s probably time to call a professional! Partition 1 is now the selected partition.ĭiskPart successfully shrunk the volume by: 1024 MBĭiskPart succeeded in creating the specified partition.ĭiskPart successfully formatted the volume.įollowing these steps, the machine should now be bootable. I’ve bolded the commands I typed to make it easier to read - hold on tight:Ĭopyright (C) 1999-2013 Microsoft Corporation. Here’s how it’s done at a command prompt from a recovery environment. However, all is not yet lost! It’s fixable - but in order to accomplish it, you must recreate the EFI partition manually and then reload the boot parameters from there. If this happens, most people will tell you that you will need to reinstall Windows from scratch. Sometimes the tools (especially if executed externally on another system rather than live within the target OS) will remove the EFI partition and only image the Windows partition. This is most often the case following a drive image using imaging tools to a new SSD for example. Other times, forcibly removing the EFI and boot folders from the EFI partition and then executing the bcdboot command with a specific system partition parameter (e.g.: bcdboot X:\windows /s E:, where X: is the Windows partition and E: is the EFI paritition) works.īut let’s say the partition is missing altogether. If it’s corrupt but still exists, you can simply enter diskpart, select the system partition (usually around 500 MB in size and with an ID of “EFI”) and assign it a letter, exit diskpart, and then perform a chkdsk command on the new partition assignment. Essentially, the system is looking for the EFI partition, which in this case is either missing or corrupt. This is bad news on a GPT disk using UEFI rather than BIOS. Performing bootrec /fixboot also provokes the following error: The requested system device cannot be found. The boot configuration data store can not be opened. In many cases the failure is evident when attempting to perform bcdedit /enum and receiving a message such as this one: However, other times, even in spite of this command properly completing, the system still will not boot. Generally speaking, it’s often easy enough to accomplish this by executing the command bcdboot X:\windows (where X is the system drive letter) from a recovery environment. With GPT disks and UEFI all the rage now, it’s not uncommon to encounter a scenario where boot parameters need to be repaired in order to reach the operating system.
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