Your task shows you are running imagew. REMEXEC25=ldrun h:\osd\IMAGEW~1\imagew.exe /r /o /d:0 /f:"""i:\Win7_64\Image_1\LD6431~1.TBI""" /rb:0
If you boot back into WinPE I would check the drive letters assigned as you may find c: was assigned to the system partition for Windows 7 rather than the actual c drive. If this is the case this means you unattend was injected to the wrong place.
Fixwindows is meant to resolve this but as per the link I sent depending on your LDMS version this can be a problem with newer versions of LDMS / WinPE
What version and SP of LDMS are you on?