Your pack seems to be for fresh installs. I don't want to install XP again, I just want to turn off WFP. I don't see why it can't be done after everything is installed. Can someone please give me instructions to disable WFP using this sfc_os.dll? What registry entries must I change and to what? I just told you There is no sfc_os.dll in dllcache. For the hell of it, I tried changing the one in the servicepackfiles folder, but I get the same error. And if windows changed it back, I don't think I'd get the error.