: Modified ISOs often contain pre-installed malware, rootkits, or adware. Because these are "closed-source" modifications, you cannot easily verify what hidden software has been injected. Disabled Security
Creators use software tools to permanently delete core parts of the operating system. They remove system drivers, language packs, help files, and foundational Windows features to force the file into a smaller size. The Hidden Risks of Sub-1GB Windows 7 Builds windows 7 ultimate 64 bit highly compressed 928 mb
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Standard ISO files include thousands of universal drivers for printers, network cards, and graphics processors. Highly compressed versions strip these out to save space. What Is Removed to Reach 928 MB? windows 7 ultimate 64 bit highly compressed 928 mb