According to those at Microsoft, you need the following configuration you can run Windows 7 on a PC: - 1 GHz processor or better on (32bit) or (64bit) -1GB Memory RAM (32bit) or 2GB RAM (64bit) -16GB free hard disk space (32bit) or 20GB on (64bit) - A DirectX 9 compatible video card with WDDM driver 1.0 or newer But we know that Windows does not eat as much memory as Windows Vista. So a PC with 512MB RAM or less can run the new version of Windows, well, someone has tried on a computer with only 96MB RAM. But if you try to install Windows 7 on a computer older than 4 years and has less RAM 512MB install will tell you that your memory is not sufficient, and Windows 7 installation will stop. Any ideas? 1. Extract the ISO image files from Windows 7 2. Download and install the editor dll, AptEdit Pro, or WinHex such 3. Open the source folder winsetup.dll 4. Search string 77073D7801 5. Change it to E90400000 6. Save and then close the application 7. Recreate ISO image with new configuration and restart the installation. Does anyone else have another idea?