Can you run less than 5GB on a 64 bit OS?

I have installed 64-bit operating system and 5 GB RAM installed but my point is only 3GB I have tried everything but it still will not give anyone could help me and thanks in advance
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  1. minimum for 64-bit Windows 7 is 2GB, it's 1GB for 32-bit

    http://windows.microsoft.com/systemrequirements
  2. What combination of sizes and speeds and voltages of RAM DIMM do you have?
  3. I cannot imagine why you have 5 GB of RAM installed.... 2 2GB sticks and 2 512MB sticks?

    What is your video card?
  4. physical address extension active on mobo?
  5. mi1ez said:
    What combination of sizes and speeds and voltages of RAM DIMM do you have?

    I have a dual core processor 2x2.60mhz
  6. "I have a dual core processor 2x2.60mhz"

    That doesn't answer the question!
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