Windows 10: Unceasingly high Physical Memory usage

For the past week or so, my computer has been using an obscenely high amount of physical memory, unendingly. It's been running between 96 to 99% of 8.0 GB of RAM, even when I have no other applications open. Nothing in the task manager seems to come even close to using that much memory. [Here's a screenshot of my Task Manager and Process Explorer](http://imgur.com/a/E7piW).

I've tried restarting the computer, but the probably persists immediately on boot up. I've also run rkill and malwarebytes as the sticky suggests, but everything has come up clean.

It doesn't seem to get in the way of simple things like browsing the internet. But I've run into some sort of severe lag or fps drops while gaming. I'm assuming the two are related...

I suppose I should also note that I haven't gotten any system alerts from Windows about high memory usage...it's just been quietly high.

I searched recent posts, and there were a couple similar but they were either unresolved or didn't quite apply to me.

Any thoughts or suggestions (besides downloading more RAM /s)? Thanks in advance!