Microsoft Diagnostics and Recovery Toolset aka DaRT 8

DaRT 8 helps IT departments easily recover PCs that have become unusable by assisting to rapidly diagnose issues and quickly repair unbootable or locked-out systems, all without leaving their desks. Key updates to this version include:

• Windows 8 Ready: People can leverage the powerful DaRT tools not only on their existing hardware but on all Windows 8 devices with the Unified Extensible Firmware Interface (UEFI) and GUID partition tables.
• Easier to Deploy: DaRT 8 now provides native support for USB media deployments within the image creation wizard with no additional tools required.
• Automating Image Creation: The DaRT image creation wizard is now built on top of PowerShell cmdlets, allowing IT departments to mount, create, apply, dismount and burn the DaRT image via scripting – ultimately, letting the image creation process be saved and repurposed for later use.

More information can be found here and here;