Results of recent of installed/reinstalled Windows 10 computer is delivered (yours or others: P) and then you realized that you were either lazy to reinstall all programs that you use for manual transfer and personal files C: \ or miss system we were using (If you keep them there), you will probably be happy to know that you can return to old operating system (previously installed) using the Windows.old folder ( programs, settings, and documents are restored in the system folders ( where did she age before reinstallation). Warning! Make sure there is a folder named before you deploy the files in this Windows.old tutorial on the system partition and that there is enough free space on it. It is also advisable to back up the Windows. old folder before making changes to it.