On booting my system this morning, I checked for updates, there was a message saying that the download of Build 16299 had failed. There was also an NVidia update listed. I let that install but wasn't favourably impressed with the black areas on many of the windows afterwards. Those black areas cleared after mousing to each of them in turn and left clicking.
The driver for my video card was changed to version
23.21.13.8778 (this driver is not yet shown on the NVidia site.)
I rebooted, after deleting all the files in \SoftwareDistribution\Download and checked for updates again. Build 16299 downloaded normally.
The update progressed normally to "Working on updates 98%" then a dialog box/window titled "Install Windows" with this message appeared.
"Windows could not complete the installation. To install Windows on this computer, restart the installation."
That box was over the message "Don't turn off ... " The throbber was still circling, there was some drive activity, but no response to mouse or keyboard.
This is the second time this has happened with a build update, Build 16293 had a very similar process. 16296 installed without any hiccups at all.
Turned the machine off after about 10 minutes. After power on, and a very long boot up time, video appeared on my primary monitor, with "Working on updates 100%." It then went to the log-on and now it is running Build 16299.0. I have 3 monitors, one was disabled, but I have enabled it without any problem.
Reported to Feedback Hub.