I am at 90% memory usage, but cannot find the reason why.

From what I just read, non-paged pool memory is the part of the memory that is being used by drivers and system components. The article seems to suggest that this is most comonly caused by the network driver. Have you restarted the computer when this started happening to see if that helped? Otherwise, download Snail Driver to help update any outdated drivers.

Duffo said:

...My memory usage is fluctuating between 85%-95%, and I cannot seem to find out the reason why.....

Welcome to Ten Forums.

I count some 50-60 Chrome processes in your screenshots. Just how many tabs do you have open? I can push my memory usage up to 90% by opening some 35 tabs in Firefox....



...but that quickly drops to a more normal 66% if I close all bar one of the tabs....



....and down to 50% if I close Firefox.

4gig is going to have issues with modern OS’s like Windows 10. You really need a minimum of 8gig. Chrome will use more processes depending on what you are doing. Chrome has its own Task Manager and other tools built inti it.

Duffo said:

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I only have 4 tabs open, as I'm finishing some work.

It would help if you were to update your system specs. It would give us a bit more to work with in trying to help you.

System Specs - Fill in at Ten Forums

Specifically, how much RAM is in your computer? From what I see, it would seem to be 8GB, but I cant be certain.