Microsoft provides a "repent drug" for upgrading to the official Win7/Win8.1 system of Win10. It can be rolled back to Windows 7 or Windows 8.1 before the upgrade. However, this "drug" has a shelf life and is valid for one month from the date of successful upgrade of Windows 10. It has been verified by the IT House that this process can be repeated during this time period.
It is important to note that in addition to the limitations of time, friends who like to clean the computer should not delete the Windows.old folder too early, otherwise they will not be able to return to the sky. If you want to clean this folder, the safest way is to wait until the current Win10 has passed the "full moon" and then start. At this time, the original system folder can not be rolled back, and the deletion is harmless.
The process of rolling back from Win10 to Win7/Win8.1 is relatively simple and fast. Now the official release of Win10 is just a month's time. The first batch of users who have upgraded the official version of Win10 through Microsoft push may want to retreat the old system.
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