4 of 8gb of RAM is hardware reserved

[Zeedeo]

Recently issue in which I started getting Windows warnings about potential memory loss or that programs are using too much memory and advising me to close them. Open my Computer properties:

8gb installed, 3.96 usable. As you can see I am currently using an APU, but not for graphics. I am using a GTX 660 for my GPU. Upon looking into the BIOS (ASRock BIOS - Mobo is ASRock FM2A75M-DGS) I didn't see any options for allocating memory that would allow my APU to be taking 4 gigs of RAM, but that could be my inexperience with this BIOS. This mobo has 2 RAM slots and upon swapping I booted up fine with the same issue of 1/2 of my ram being unusable. In Task Manager->Performance->Resource Monitor->Memory, I see that 4141Mb is Hardware Reserved. I updated my graphics drivers on the 29th.

That's about all the info I have. Any suggestions?

 

[Tradesman1]

What OS? have you checked each stick by itself to see if both run in each slot singly

 

[Zeedeo]

What OS? have you checked each stick by itself to see if both run in each slot singly

Sorry about that, my image wasn't showing up since I linked directly to Gyazo.
It's Win 7 64-bit Home Premium, and yes, I have checked both sticks individually.

 

[Tradesman1]

Try raising the CPU/NB voltage to about 1.22

 

[Zeedeo]

Try raising the CPU/NB voltage to about 1.22

Did this to no avail.

 

[Tradesman1]

What model (s) of DRAM

 

[sulumordna]

Are you sure you are a 64 bit Windows?