Windows Vista reports less RAM than is available
Windows Vista might report less RAM than you have installed on your computer. This can happen if you run a 32-bit version of Windows Vista and have 4 Gigabytes of RAM installed on it. The incorrect amount of RAM is shown in the System Properties and System Information. Many users do not know why this is reported incorrectly and demand an explanation for this behavior.
The maximum amount of RAM that can be handled by a 32-bit system is 4 Gigabytes. Memory may be relocated to make room for addresses that the basic input/output system (BIOS) reserves for hardware. A 32-bit version of Windows Vista is able to address 4 Gigabytes of RAM if the so called Physical Address Extension (PAE) is supported by the CPU.
You can enable PAE mode by opening a command shell and type Run BCDEDIT /SET PAE ForceEnable
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