. A standard XP installation requires at least 64MB–128MB of RAM to be functional. In contrast, a lite version can idle at approximately 35MB to 80MB of RAM usage
Most "extreme" versions aim for an ISO size between 70MB and 100MB . windows xp lite iso 72mb portable
Windows XP Super-Nano Lite : Alexey Petrov & Microsoft Corporation windows xp lite iso 72mb portable