We are seeing similar issues when deploying to Dell systems. So far we have seen it randomly on a Dell OptiPlex 990, and twice on Lattitude E5440s. Re-running the task sequence usually solves the issue for us. One thing we've seen is that it seems to apply the base WIM, but nothing beyond that, and anything included in the base WIM beyond just windows fails to function. There don't appear to be any logs other than ccmsetup which is reporting the wrong version of BITS on Windows 7 Professional. I've attached both a screenshot of Windows 7 Enterprise after logging in, and the ccmsetup.log file from the most recent system we had this issue on.
ccmsetup.log