I have 16 gigs of memory on a win pro 7 os, the system sees 16 but says only 7.9 is available. what is happening with my memory.

It probably has something to do with your system hardware. What is the exact make, model and series of your motherboard or computer system?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.