Have you tried Windows 10 and are not happy with you? Although Microsoft states that its new operating system is the best version of Windows, there may be several who do not agree, or love the old good old 7.
If you try Windows 10, with the free upgrade offer, and decide that Windows 7 or 8.1 is better for you, you can go back to your old OS very easily.
Microsoft enables you to quickly return to your favorite operating system in Windows 7 or 8.1 if you do not like Window 10, directly from your operating system settings.
Let's say that downgrade uses το φάκελο Windows.old που δημιουργεί αυτόματα κατά την εγκατάσταση το Windοws 10.
From the Start menu, follow the path: Settings / Updates and Security.
There you will find the retrieval option.
From the selection shown in the image below with a single click, you will begin to downgrade.
Once you click this option, Microsoft will prompt you for the reason you want to change operational. 
Let's say the downgrade process takes a while and you will probably lose your installed applications.
All your personal files will be kept as they were.
