SysPrep gone horribly wrong

The problem was:

The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed.
To install Windows, click "OK" to restart the computer, and then restart the installation.

In retro-aspect it was just a little registry that needed to be changed. Here is the solution:

• On the error screen press SHIFT+F10 to start Command Prompt.
• Start Registry Editor by typing regedit and press ENTER.
• Navigate to HKEY_LOCAL_MACHINE/SYSTEM/SETUP/STATUS/ChildCompletion on the left panel (tree)
• Double-Click on setup.exe in right panel and change the value to 3 (in my case from 1).
• Close the Registry Editor.
• Close the Command Prompt by typing exit and press ENTER.
• Click on OK, computer will restart and setup will continue.

I wonder how much time I would have saved, if I had known about it in the morning.