Fixes an issue in the Cdboot.efi, Cdboot_noprompt.efi, Efisys.bin, and Efisys_noprompt.bin files that causes a "Boot failed" error message. This issue occurs when you start a UEFI-enabled computer from the installation DVD of a 64-bit version of Windows 7 or Windows Server 2008 R2.

Press any key to boot from CD/DVD. In this scenario, you receive an error message that resembles the following: Boot failed. Cause. This issue occurs because the boot manager compares two device signatures incorrectly.

When the Windows Boot Manager application (Bootmgfw.efi) tries to clean up these page table entries, this application accesses an invalid memory address and causes an access violation exception. Resolution Hotfix information. A supported hotfix is available from Microsoft.

A recoverable error occurs when Winload.efi or Winresume.efi is loaded, and then Windows Recovery Environment (WinRE) is started. In the scenario, the startup process may hang (stop responding) at a black screen.

How to format a USB flash drive or external storage device to NTFS on Windows. To update or repair an Xbox console from a USB flash drive, you'll need a 4 GB USB flash drive formatted to NTFS. For more info about troubleshooting system updates, see: Troubleshoot system updates on Xbox.

Resolution. To fix this, use the following methods to troubleshoot this Windows Start error. Note To complete these steps, you must have a Windows 8.1, Windows 8, Windows 7 or Windows Vista installation disc. If you do not have a disc, please contact your computer manufacturer or Microsoft Support to obtain one.

For Windows 10 and later versions, a Windows Defender Application Control (WDAC) policy will be used that blocks vulnerable Windows boot managers. When the policy is applied to a Windows system, the boot manager will “lock” the policy to the system by adding a variable to the UEFI firmware.

In the details pane, right-click or swipe down on Windows Installer, and then select Start. Describes how to use the clean boot process to troubleshoot a problem in Windows 8.1, Windows 8, Windows 7, or Windows Vista.

You can use installation media (a USB flash drive or DVD) to install a new copy of Windows, perform a clean installation, or reinstall Windows. To create installation media, go to the software download website, where you'll find step-by-step instructions.

Learn how to enable virtualization through the UEFI (or BIOS) of your PC to run the Windows Subsystem for Android or Windows Subsystem for Linux.