ReactOS for low specification computer

Hardware support

ReactOS has limited hardware support. Lists of particular hardware that have been tested can be found on the page Supported Hardware.
Minimum hardware requirements

The minimum requirements to install ReactOS are:

   RAM: at least 64 MB, recommended 256 MB, and even 2048 MB if you want to test large software suites or bundles.
   Processor: x86 or x64 architecture, Pentium or later and compatibles; for more information see ReactOS ports.
   HDD: IDE/SATA with minimum 450 MB of free space on the primary partition (please note that some SATA controllers may not work with ReactOS):
       FAT16/FAT32 primary boot partition.
   Video: VGA compatible video card (VESA BIOS version 2.0 or later).

https://www.reactos.org/download