To achieve that small size, the modder had to cut features. Depending on who built the specific ISO you are using, you might find:
Enter BIOS (F2/DEL during boot).
Before you download and install any "Lite" version of Windows, there are critical factors to keep in mind: windows 7 home premium lite x64
Have you tested a specific Windows 7 Lite build? Share your SHA-1 hash and experience in the comments below. To achieve that small size, the modder had to cut features