why can i not use all my ram windows 7 64bit installed 6144MB, hardware reserve 4358MB available to use 1786

Your system is not setup correctly. You will need to read the user manual carefully or contact the system's Technical Support for more information. Windows has no control over this, it is meerly reporting what the hardware tells it.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, You can use the different slots to test issue. The better option is contacting the manufactory of motherboard. Best Regards, Kim ZhouPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Are you concerned about the "hardware reserved" or the fact that it and available doesnt equal 6 gigs? The "missing" could be for shared video memory, and other processes. Where did you see those figures?