I had this problem , try unplugging everything attached to your sp including your micro sd card, than if any other updates are cued up uncheck them and run each one at a time. After I was done and it went thru than i did this, ((Try opening a command prompt window as an administrator and running
sfc /scannow (disclosure cut, copied from someone in another thread, but this is supposed to clear out issues left behind,)) i also read if your update did not go through than run this and retry the update with everything unplugged.