Windows 7 does not support Secure Boot. Enter your UEFI/BIOS (usually by pressing F2, DEL, or F12 during startup) and:
Some UEFI implementations require to boot Windows 7. If your PC fails to recognize the USB drive, enable CSM and set it to "UEFI first." Windows 7 Uefi Iso Download
If you have an active MSDN subscription or a Volume Licensing Service Center (VLSC) account, you can download the original "Windows 7 with SP1" ISO files. Note that even these stock ISOs do not fully support UEFI out of the box for all system configurations. You will still need to modify the installation media. Windows 7 does not support Secure Boot
: Sites like Heidoc.net provide links to original Microsoft servers, though availability fluctuates. How to Create a UEFI Bootable Windows 7 USB Note that even these stock ISOs do not
While Microsoft no longer officially hosts Windows 7 ISO files on its main site, users with a valid product key can still obtain legitimate copies through specialized archives or manufacturer recovery tools. Installing Windows 7 on modern UEFI systems requires specific 64-bit ISOs and specialized preparation to ensure compatibility with GPT partition schemes. Legitimate Sources for Windows 7 ISO Downloads
Before downloading anything, it is crucial to understand why a standard Windows 7 ISO fails on UEFI systems.