To achieve this "tiny" footprint, many features were sacrificed. Default drivers, the Aero glass effects, and native Windows programs like Media Center and tablet support were stripped away. In their place, the creator bundled lightweight alternatives like Foxit Reader for PDFs and for files. The OS even included a custom wallpaper and a TCP/IP patcher
To keep the size small, the Windows Update service is usually completely stripped out, leaving the system permanently vulnerable to security flaws discovered after the ISO was created. Security and Ethical Risks Tiny Windows 7 X64 Iso Download