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#1150
That is sad. I physically disconnected every drive except my C: drive.
Just remember for next time: Buy an external HDD, and backup your files on every HDD and do a System Restore. That way, when this happens again, you will be prepared. Always be prepared. :)
I don't know either why an update would do that.
Edit: Wait, go to File Explorer and click "This PC" and see if the stuff is still in that HDD in File Explorer.
System updated, no clean install, everything is working fine, i found there is a "windows.old" folder, it is very big almost 20 Gb, should i delete it?