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Permission denied and other problems after installing KB4457144
I installed KB4457144, KB4457918, and KB890830 and after rebooting had the following problems:
- A shortcut to a batch file was no longer in the startup folder.
- boot.bat, the batch file run by the shortcut was missing
- auto.bat, a batch file invoked by "start cmd.exe /k" in boot.bat was missing
- trying to copy those files back resulted in a permission denied error.
I backed off KB4457144. The permission denied error disappeared. I was able to restore the missing items and reboot as usual. It looks like the update is trying to erase all unknown batch files invoked at startup via "start cmd.exe".
I received no notifications of these actions nor could I find any relevant messages in the event viewer.