Why is my PC so slow, and why is it showing only 1GB usable RAM when I have 4GB installed?

September 04, 2014 at 03:07PM:

My system has 4GB of RAM installed but the OS shows only 989MB usable and the PC is very slow. How can I resolve this?

Post and answer: Why is my PC so slow, and why is it showing only 1GB usable RAM when I have 4GB installed?

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