I'm using the rt_7_lite_win7_Vista_x64_sp1 build on a Win 7 Pro x64 SP1 platform. The purpose of the exercise is to slipstream the latest updates into the en_windows_7_professional_with_sp1_x64_dvd_u_676939 iso file. The integration and ISO build phases complete without error. The msu files are downloaded from MS and seem to be fine. Once the iso build completes I try to do a test build with it fails during the extraction phase claiming corrupted or missing files. As an aside, the only msu updates I have incorporated are MS security updates.