I have tried this update on two computers as well (one laptop and one desktop). Both with catastrophic consequences. After a restart both computers had not been able to start up and hung for hours. Only way I was able to use them again, was to restore an Image I made before hand. Both were updated through WU and the computers were in different locations and networks. I have not tried updating manually and I am not going to. The issue has been reported through the Feedback hub....