Installation guide "clean" Windows 10

A new install or clean install is a good option when you want to install a new operating system, specifically Windows 10, so that it can be completely removed. Common errors in older operating systems.
More than 14 million computers have been upgraded to Windows 10 - Microsoft's new operating system. Although Microsoft has yet to provide a specific guide for installing a clean copy of Windows 10 on your computer, you can still do this by following these steps.
1. If your computer is on Windows 7 or Windows 8.1
Backing up all your data is the first thing you need to do. To install a clean copy of Windows 10, you will still need to upgrade your operating system to Windows 10 before proceeding to the next step. This is to ensure that Windows 10 will "get" the product key of your computer and avoid problems occurring during the upgrade process. You can skip this step, but it will be very annoying because Microsoft has warned that there is a risk that Windows 10 will not recognize the product key on the motherboard. There are two ways to accomplish this first step, which is to use the traditional update feature for Windows versions, but here we will not use this method. Instead, visit the official Microsoft website and download the Windows 10 product key installer that fits your computer. Once downloaded, the installer will provide two options: Upgrade this PC or Create Installation Media for another PC. Select Upgrade this PC and follow the steps as normal.
Once the installation is complete and your computer is up to Windows 10, make sure that you are logged in with the correct Microsoft Account you want to use. Next, select Settings> Updates and Security> Activation to check the installed version of Windows 10. Remember this correctly, then reload the Windows 10 installer again. At this second option: Create Installation media for another PC. Have a USB drive with at least 3GB free space or a DVD to hold ISO files. Be sure to select the correct version of Windows 10 that you have installed. When everything is ready, restart your computer and enter the BIOS to run the software from the USB or DVD you already have. Select Custom Installation to "format" all old data. Click "Skip" when asked to enter a product key. After the installation is complete, Windows 10 will automatically be activated. If you are having problems, you can type "slmgr.vbs / ato" from the command prompt cmd to activate.
2. If your computer is in Windows 10 preview
It will take a bit longer if your computer is running Windows 10 preview because you will need to return your computer to Windows 7 professional product key or Windows 8.1 product key before performing the same steps above. To "restore" back to the old version, use the DVD containing the installation file included with the computer. If your computer is already pre-installed on Windows 10, contact your provider for assistance. Risking this step may cause you to lose the ability to activate the operating system. Your version of Windows 10 must be upgraded from Windows 8.1 or Windows 7 before you can take steps to get a clean version of Windows 10.