In my opinion, save yourself the pain and agony so many of us have gone through, and do not install Windows 7 SP1 via WSUS until Microsoft figures out what is causing it to hang on deployments. At this point, I would not recommend installing it from anything but a DVD or ISO of the full Service Pack. That has been successful for me; if the machine wasn’t already messed up by a WSUS deployment attempt of SP1, in which case it still fails. See the following posts for the pain. And the word from Microsoft is to not modify … Continue reading DO NOT install Windows 7 SP1 using WSUS until Microsoft figures out where it is going wrong!