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So, do "System Restore" and roll back to a previous snapshot.

Hmm...

img_0523-jpg.675607
 
As stated before, you'll need to do a reinstall then, as it's not finding your installation.
 
Those are editions the disc can install. Those aren't installations on your hard drive.
 
Walk through the installation. I cannot guarantee your files will make it through. They should but there's no guarantee.
 

Can you please explain how I follow these instructions..? Is it like this?:

1) Plug off USB stick
2) Click close and click "Power off"
3) Turn MacBook on and boot from which Partition? BOOTCAMP or the USB stick?
If I boot to the BOOTCAMP partition, I get the error with the black screen and the blinking bar. Can't do anything.

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