12GB RAM installed, 8GB usable. [Anwsered]

12GB RAM installed, 8GB usable.

Apologies if this has been asked before but I haven't been able to find a good answer.  In system settings, it has been displaying

Installed Memory: 12.00GB (8.00GB Usable)
I've unchecked maximum memory in MSCONFIG boot and checked my BIOS. 
For a while it showed all 12 were usable so I'm doubting it's a hardware problem.
Thoughts?

Solutions to the Problem 12GB RAM installed, 8GB usable.

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Hi,
I would suggest you to refer the link below and check if it helps.
http://support.microsoft.com/kb/978610
 
Hope this information is helpful.

Use the System File Checker tool to repair corrupted or missing system files:

1. Click Start.
2. Type cmd, and then press CTRL+SHIFT+ENTER to open the elevated command prompt (I.e. Command prompt with administrative rights).
3. The User Account Control window should appear, be sure that the action it exhibits is correct, and then press the Continue button.
4. Type or copy paste the below command line into it without quotes:
5. "Sfc /scannow"

Recommended Method to Fix the Problem: 12GB RAM installed, 8GB usable.:

 

 

How to Fix 12GB RAM installed, 8GB usable. with SmartPCFixer?

1. Download SmartPCFixer . Install it on your system.  Click Scan, and it will perform a scan for your computer. The errors will be shown in the list.

2. After the scan is finished, you can see the errors and problems which need to be fixed.

3. The Repair part is done, the speed of your computer will be much higher than before and the errors have been removed. You can also use other functions in SmartPCFixer. Like dll downloading, windows updating and print spooler error repair.

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