How to reinstall the system after upgrading Win10?

Tens of millions of users around the world have already used the Windows 10 system. In this "non-destructive upgrade", Win10 retains almost all the files before the user.

But at the same time C disk (strictly speaking, the installation partition) available space has also been reduced, we have shared the release method, of course, there is a more thorough is format re-installation. Here are a few tips and notes for your reference.
1, Win10 must be activated
Microsoft is currently more tolerant of the OEM policy, almost automatically update the available Win7/8.1 users can be directly activated after the upgrade. The specific way to view is: right click "this computer" & mdash; & mdash; & ldquo; attribute & rdquo; or set & mdash; & mdash; update and security & mdash; & mdash;


2, download the official ISO image
the official and third-party upgrade tool, we can find and build ISO image (method) in the local ESD download files.
If you need to download directly, we have given the address of the network disk before, we choose. It should be noted that if UEFI is started, 32 bits must be installed for 32 bits, and 64 bits should be installed for 64 bits.
3, installation preparation
- backup file. Generally included library files, desktops, browser favorites, and more.
-Download the driver in advance. Because it is a new installation, so after the first upgrade, which hardware is not driven naturally, you can prepare in advance, here is recommended to use the driver wizard.
4, it is recommended to make a U disk boot disk
U disk boot disk production method can refer to this article, non-UEFI can use UltraISO;
hard disk installation can use Win7 PE or nt6 hdd installer.
When the following two screens appear during the installation process, skip the key input.

Click “Skip”

Click “Speak later>
5, activate after installation
When upgrading from Win7/Win8.1 to Win10, Microsoft Your activation information will be saved on the server. After reinstalling Win10, the network will be activated (depending on the situation, there will be differences in waiting lengths).
The above is how to reinstall the system after upgrading Win10 and some procedures and precautions, I hope to help everyone!