For information about QFE updates, see http://msdn.microsoft.com/en-us/library/windows/hardware/dn284526.aspx .
To get the latest QFEs for the Windows HCK, run http://msdn.microsoft.com/en-us/windows/hardware/gg454513 . The Windows HCK download includes all previous QFE updates.
http://msdn.microsoft.com/en-us/library/windows/hardware/dn284526.aspx
http://msdn.microsoft.com/en-us/windows/hardware/gg454513
http://msdn.microsoft.com/en-us/windows/hardware/gg454513
Note: Before applying the QFE, close all active HCK Studio sessions. Applying this QFE might affect in-progress submissions, so please complete any submissions before applying the QFE. After installing this QFE, you'll need to regenerate any affected submission that was generated before the QFE was installed.