RAM usage 90%+!!! HELP!

[Mason Methot]

I don't know why but suddenly my RAM spiked up to over 90% and won't go down! I built a brand new computer many months ago and installed 8GB of Kingston ram and never had it go over 60% Only like 3 programs open and it is being fully used while CPU idles at 30%! I checked task manager (which took forever) and it looks like the culprit is Service Host: Local System (Network Restricted)
When I try and end it Windows tells me my system might become unstable blah blah blah. What the hell is happening!?

TIA

 

[RockyPlays]

Have you tried restarting your PC?