Windows 7 Ultimate 64 Bit Highly Compressed 10mb Best New ^new^

If you want a “portable” Windows 7:

Download official ISO files directly from Microsoft or verified archive sources. Expect the download size to be several gigabytes. Lightweight Linux Distributions: windows 7 ultimate 64 bit highly compressed 10mb best new

The laws of data compression are unforgiving. Anyone claiming otherwise is selling you a keylogger. If you want a “portable” Windows 7: Download