Just so anyone getting the \boot\bcd error knows, this error can happen if you're working with real physical devices which at some point in their lifespan were Ghosted (or imaged using some similar imaging method) and as a result have the same GUID as other devices in the SCCM All Systems collection.
A way around the issue is to power off a machine(s) having the problem(i.e. the machines with identical GUIDs), (make note of its GUID & MAC address before you do), delete the machine(s) from SCCM's All Systems collection, then manually re-add each device (which is why I suggest knowing its MAC address).
And specifically if you're getting this error following anyweb's tutorial here on Build and Capture, you'll want to assign the device back to the build and capture collection once you done the aforementioned delete/manual re-add.
Credit goes to http://adventuresinosd.blogspot.com/2011_03_01_archive.html (scroll down on that page)