How can I make Windows recognize my full amount of RAM?

Douglas Mutay October 18, 2012
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I have Windows 7 installed in my laptop and recently found that the OS is only recognize 2Gb of my RAM while I have 4GB of RAM installed.
Is one of my RAM modules faulty or is there any setting I need to adjust? The same happened when I installed Windows 8 Consumer Preview.
I have checked the BIOS and it shows 4Gb or memory available. Thank you for your support.

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