Since Microsoft announced that Windows 10 would be a free upgrade for users of Windows 7 and newer, people have been upgrading by the millions. Within the first three months of its release, Microsoft reported that over 110 million devices already had the new OS installed. This sleek, modern operating system combines the best parts of Windows 7, 8, and 8.1, while also adding new features and software. Overall, it has garnered a positive reception. However, people who wish to stick with older versions of Windows are finding that, through Windows Update, Windows 10 is automatically downloading to their hard drives, and, in many cases, installing without their consent. If this has happened to you, or if you want to ensure it does not, here is a guide for you.
What to do if Windows 10 already installed
If you wish to revert back to the previous version of Windows, the process is simple: just open the Start menu, select Settings, click the “Update & Security” icon, and select “Recovery.” You will then see “Go back to Windows X (your last version of Windows).” Click on that and follow the easy steps to restore your system.
What to do to stop Windows 10 from downloading
If you want to ensure Windows 10 does not install (again), you will need to block Windows 10 updates. There are two ways to do so.
Method 1: Download\run GWX Control Panel (freeware)
This easy, intuitive program provides you with options for blocking Windows 10 or removing existing installation files. You can find the GWX Control Panel HERE . Just click on “Download Installer” on the right side of the page and follow the instructions. Once you run the program, you will want to click the boxes to prevent Windows 10 upgrades, delete Windows 10 programs, disable ‘Get Windows 10’ app, and delete Windows 10 download folders. Once this is accomplished, Windows 10 will not be an issue again. Should you change your mind later, you can simply reverse this process from GWX.
Note: If you have Windows 10 already installed, do not use GXW Control Panel. This should only be used from Windows 7, 8, or 8.1.
Method 2: Download\run patch from Microsoft and edit the registry
Most people will want to use the first method, but if you prefer to go through the steps yourself, you can download a patch from Microsoft and then edit the registry. If this is the route you want to take, check out THIS article.

