Restart your computer and enter the BIOS/UEFI settings to set the USB drive as the primary boot device.
An ISO is simply installation media. Downloading a clean ISO from a parent directory does not grant a free license. You will still need a legitimate, matching retail or OEM product key (printed on the sticker of your old hardware or documentation) to activate the operating system. Post-Install Security Patching
The Internet Archive also hosts individual, verified ISO uploads for most editions. Some of the verified and direct links you can search for include: parent directory index of windows 7 iso
Downloading an operating system ISO from an unverified, open web directory poses severe security threats. 1. Malware and Injection
Files on misconfigured servers are often incomplete, leading to installation failures or random system crashes. Restart your computer and enter the BIOS/UEFI settings
This shows the of the booted Windows PE environment (which is essentially the root of the installation media).
A general directory of various old OS ISOs including a dedicated Windows 7 section. Digitalhemi Index of Windows Highlights: You will still need a legitimate, matching retail
When downloading from an "index of" site, always verify the file's integrity to ensure it hasn't been tampered with. You can use the built-in Windows tool to check the SHA-1 hash. Edition Architecture Known SHA-1 Hash (Example) Ultimate SP1 5E7A5AECF92B09B09A6AF4FA6D9D25F1A5E4F4E5 Ultimate SP1 DA5E224B15DF0A6C1103A7937AC7A1250C2F0D18 Professional SP1 0BCFC54019EA175B1EE51F6D2B207A3D14DD2B58 Alternative "Clean" Methods
http://msft-dnl.digitalrivercontent.net/.../X17-59465.iso