I know. It even happened to me. I installed 4GB on my desktop and Windows Vista reported only 3GB total. I thought something was wrong with the memory, shuffled it around, ran memory tests, but nothing worked.
Then I read this: The 3GB not 4GB RAM problem. The author explains why and how. First we find out that there's a limit of memory a 32 bit system can address. But even so, the actuall memory is less than the addressable limit, because of reserved memory imposed by chipsets.
Even though Windows Vista 64 bit has a much higher limit (128GB RAM), it may still be limited, depending on the chipset!
If you are running 32-bit Windows, you must live with it. You will not ever see all 4GB of RAM you've paid for.
If you are running 64-bit Windows, you may have to live with it. Depending on your motherboard's chipset, your system may support memory remapping. If so, you will be able to use all 4GB of RAM.
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