How to format C drive reinstall Win10 system

Normal channel upgrade Win10 from Win7/Win8.1 will not format the C drive, so the installed Win10 system will not be clean, there are files in the C drive that retain the original system. So how do you format the C drive and reinstall the system?

specific methods:

1, download Win10 ISO image;

2, making U disk;

3, start formatting pe C disk;

4, install win10 in pe

The above is how to format the C disk reloading system, using the traditional reloading system, you can automatically format C drive, this is also the most pure Win10 system installed Win10. More detailed steps can refer to: how to reinstall Win10 system through WinRE.