1.2 GB – 1.8 GB. This is legitimate high compression, but it comes with functionality loss. You cannot run Windows Update, and many system features are missing.

: These files are created by third parties and often have critical security features like Microsoft Defender , User Account Control (UAC), and the firewall disabled or removed entirely.

You can find Windows Thin PC ISOs on MSDN or via the Internet Archive. This is the only "official" small Windows 7.

: Removing system components can cause certain software or hardware drivers to fail during or after installation. Legal Status

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Some popular tools for compressing Windows 7 ISO files include: