According to the system requirements from Microsoft, If you want to run Windows 7 on your PC, here's what it takes:
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1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor
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1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)
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16 GB available hard disk space (32-bit) or 20 GB (64-bit)
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DirectX 9 graphics device with WDDM 1.0 or higher driver
But we know, Windows is not so memory-hungry as Windows Vista was. So a machine with 512MB or lower RAM can handle the new version of Windows as well, someone has tried it on an old machine with 96MB only. But, if you try to install Windows 7 on your years old PC which has a RAM lower than 512MB, the installer will tell that the RAM is not enough for Windows 7 and the installation will be canceled. Any ideas?
1. Unzip or Mount the Windows 7 ISO
2. Download and install a dll editor, AptEdit Pro, WinHEX for example
3. Open the winsetup.dll under source folder
4. Find 77073D7801 string
5. Modify to E90400000
6. Save and quit
7. Recreate to a ISO and restart the installation
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