RAM/Memory Usage Problems

Hey, so I recently(month) ago bought a new computer and built it myself. There has always been this RAM problem with it that I can't seem to fix. I have 2x8GB og RAM and when I open Task Manager sometimes it shows me that I use 90%+ of it, although I can see that not more then 500MB of ram is in use(this is if I just turned on the computer). Sometimes it is fine and is at around 20%, but that too is way to much. If I can't get any help here that works I will just send in the motherboard, cpu and RAM where I bought it and they will try to fix it, but I would love to try to fix it myself first with some help.

I run Windows 8,
my CPU is a Intel Core i7-4770K,
my RAM sticks are Kingston DDR3 HyperX blu 1600MHz 2x8GB
and my mother board is a MSI Z87-G45 Gaming, Socket-1150

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