FYI: Windows 7 x64. System won't boot after installing KB2859537, system repair says ntoskrnl.exe is corrupt but can't fix it.
I used recovery command prompt to copy over ntoskrnl.exe from X:, then ran dism.exe to cleanup and revert pending actions. After that rebooted and system came up fine, but networking was hosed. It got an IP and nslookup worked, but FF and IE refused to visit any websites. Rebooted again and now everything worked.
I saw a bunch of failed updates in the log, so I did them one by one and rebooted in between. All the others worked, but after manually installing KB2859537 I got the exact same problem again... Windows boots directly into recovery mode. This time the automatic repair worked and was able to roll back the update and fix ntoskrnl.exe by itself.