During the installation process it will give you the option to delete all programs.
Uh, no. I my case it ‘found’ my Win7 installation on my SSD and reformatted it, deleting without asking all my other data on the SSD as well, then installed Win10 on hard drive over Win 8.
Your situation has nothing to do with the original poster's situation. He is receiving a new box with Win10 installed. There is no previous operating system on the box to be found and reinstalled.