my windows has been trying to install three upgrades now for about a week. now every time i shut down it installs three upgrades and every time i start up it gets stuck on "Configuring Windows upgrades 0% complete Do not turn off your computer" for (i've timed it) four minutes.. then it says "Failure configuring windows updates.. reverting changes". every time. what can i do to jettison the installation or allow the configuration? help.