According to the official system requirements of Windows 7 on Microsoft's site, it appears 32-bit Windows 7 can run on 1GB of ram.
Windows 7 system requirements
If you want to run Windows 7 on your PC, here's what it takes:
- 1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor*
- 1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
- 16 GB available hard disk space (32-bit) or 20 GB (64-bit)
- DirectX 9 graphics device with WDDM 1.0 or higher driver
Has anyone attempted this, or had any luck with the drivers?