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If you choose to “Keep nothing” when you upgrade to Windows 10, or if you reset, refresh, or reinstall Windows, your personal files are temporarily saved to the Windows.old folder for 28 days (unless you formatted your hard drive before installing). If you decide you want some or all of these files back, you can usually retrieve them from this folder.
You can run a troubleshooter that will automatically retrieve your personal files from the Windows.old folder and copy them back to their original location. The troubleshooter will work on all languages but the text in the troubleshooter is only in English.