Interestingly, all updates installed with no problems on my Windows 8 and 8.1 Pro 64 bit until KB3000850. The update installed on my laptop, with the same Windows OS, with no issues at all. On my desktop, it stated could not install and proceeded to uninstall the update. The notice that is could not be installed came during the restart after first attempting to update. The system got to 8% updated, restarted and then upon restart with the second updating that usually starts with 30% installed, quickly stopped and noted could not be installed. Then the system uninstalled it. However, the update history notes it has been successfully installed twice. What exactly is the status of this update on my system? Has it actually been installed? Is some type of log or file corrupt? Any help appreciated.