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To fix this, follow these steps: Click Start , type msconfig in the Search programs and files box, and then click msconfig in the Programs list. In the System Configuration window, click Advanced options on the Boot tab. Click to clear the Maximum memory check box, and then click OK. Restart the computer.

and done

How to fix "GB usable" RAM problem under 64bit Windows (msconfig). 
How to FIX "GB USABLE" RAM WINDOWS 64 BIT 10,8.1,8,7,XP

How to Increase the Maximum Usable Memory on Windows 
How To Fix "gb Usable" Ram Problem Under 64bit Windows

How To Fix GB Usable RAM Problem Under 64bit Windows Msconfig 

how to fix ram problem or how to fix unusable RAM ( 4 GB installed and 2.6 GB usable in any windows)

How to Increase the Maximum Usable Memory on Windows ... Windows was only able to use around 6GB of RAM out of the 8 GB