: Save the BIOS settings and restart your computer. The Windows 7 installation process should now begin. Follow the on-screen instructions to proceed.
: When prompted, enter your Windows 7 product key. Ensure it's the correct version that matches your ISO (e.g., Home, Professional, Ultimate).
If you have a supported Dell machine, this tool can still fetch official Windows 7 images. MajorGeeks, HeiDoc.net
Organizations with access to the Microsoft Volume Licensing Service Center (VLSC) may still be able to find legitimate images under their licensed downloads. Where to Safely Download Windows 7 x64 ISOs
: You'll be asked to choose your installation options, such as the language to install, the time and currency format, and the keyboard layout.
The old validation page that allowed users to enter a product key to download an ISO is no longer active.