Have 8gb of RAM but only 3.8 is available

[hepitris]

I have tried everything. I upgraded to a 64-bit copy of Windows 7. Replaced the RAM and the Motherboard (all of which work with over 4gb), among other things I've read on threads here, and I still haven't had this problem fixed. I've been having this trouble for a week. Whenever I look at the properties on my computer and when I look at my resource monitor only 3.98 of my RAM is available and the rest is Hardware reserved.
Here are my specifications:
http://puu.sh/elCdB/d60007af5a.png

Thank you for reading, any help is appreciated, have a good day!

 

[Baumy15]

Well as your ram is single channel are some of the modules busted and can you get hold of some dual channel memory?

 

[hepitris]

Well as your ram is single channel are some of the modules busted and can you get hold of some dual channel memory?

These are brand new sticks so I don't think it would be busted. But I'll exchange them for new ones soon just in case.

 

[Pinhedd]

Well as your ram is single channel are some of the modules busted and can you get hold of some dual channel memory?

These are brand new sticks so I don't think it would be busted. But I'll exchange them for new ones soon just in case.

You'd be surprised. DRAM ICs don't break easily, so if they're good when they're purchased they'll usually stay good for many years. However, a few lemons can get past QA.

What's the make and model of the memory that you have installed (specific part number please)?

 

[hepitris]

Well as your ram is single channel are some of the modules busted and can you get hold of some dual channel memory?

These are brand new sticks so I don't think it would be busted. But I'll exchange them for new ones soon just in case.

You'd be surprised. DRAM ICs don't break easily, so if they're good when they're purchased they'll usually stay good for many years. However, a few lemons can get past QA.

What's the make and model of the memory that you have installed (specific part number please)?

These are the sticks I purchased http://www.bestbuy.com/site/corsair-vengeance-2-pack-4gb-ddr3-dimm-desktop-memory-kit-blue/2904596.p?id=1218361848253&skuId=2904596

 

[Pinhedd]

Well as your ram is single channel are some of the modules busted and can you get hold of some dual channel memory?

These are brand new sticks so I don't think it would be busted. But I'll exchange them for new ones soon just in case.

You'd be surprised. DRAM ICs don't break easily, so if they're good when they're purchased they'll usually stay good for many years. However, a few lemons can get past QA.

What's the make and model of the memory that you have installed (specific part number please)?

These are the sticks I purchased http://www.bestbuy.com/site/corsair-vengeance-2-pack-4gb-ddr3-dimm-desktop-memory-kit-blue/2904596.p?id=1218361848253&skuId=2904596

Okay. Test them one at a time. If one doesn't boot, it's faulty. If they both boot independently, try and find a slot (or pair of slots) that one of them wont work in.