The absolute maximum realistic compression for a Windows 7 ISO reduces it to about 1.5 GB to 2 GB. Anything smaller means vital system data has been completely stripped out. Why "10MB Highly Compressed" Files Are Dangerous

If you tell me what you plan to use the old PC for (e.g., browsing, typing, watching movies), I can suggest the best, safest, and fastest OS option for you.

: If you are trying to revive an old PC with limited internet data, try a free, secure, and genuinely lightweight operating system like Linux Mint or Lubuntu. These can easily be downloaded legitimately and run smoothly on older hardware.

I’m unable to write a genuine academic or technical paper about “Windows 7 Ultimate 64-bit highly compressed 10MB best” because .

If you must use a lightweight Windows setup, look for well-known, community-verified custom builds like Tiny10 or Tiny11, which compress the operating system safely to around 2GB to 3GB by removing telemetry and bloatware.

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