This looks normal to me. Your system must have been running quite a while since the last reboot because you have a lot of cached stuff.
Everything that is blue is 'available'. So there is really nothing to worry about. And don't try to add up the processes. There is a lot you don't see.
Mine is similar, but I have only 8GB of RAM. The more RAM you have, the more the system will use - and this is good.
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My Computer
At a glance
Vista, Windows7, Mint Mate, Zorin, Windows 8from 1.6GHz Duo to i7
Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
Far a variety of reasons adding up the items in the memory usage column rarely produces useful or even meaningful results. Modern operating systems are far too complex for that kind of thing.
Everything looks good in the screenshot in post #4. I would like to see less free memory but that is a minor thing and often not avoidable. The idea that free memory is desirable is hopelessly outdated and has no place in any modern OS (just about anything released in the last 20 years). Standby memory is better than free memory in every way. Standby memory contributes quite a bit to performance while free memory does nothing at all. In a modern OS free memory is evil and something to be kept to a minimum. The ideal would be zero free memory at all times but we are not there yet.
The more RAM you have, the more Windows will use. This is a good thing. It is far better that memory be put to some useful purpose than sit idle.
My Computer
At a glance
Windows 7 Pro 64 bitXeon W35208 GBNvidia Geforce 210
