Windows fails to start with error Missing or Corrupt ntoskrnl.exe when keys are pressed during startup
When you press or hold down keys on the keyboard as you start your computer, you may see the following message and Windows will fail to start.
Windows could not start because the following file is missing or corrupt:
Please re-install a copy of the above file.
This problem does not occur if you do not press any keys during startup.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2022960.