Question High RAM usage in Windows 10?

Depends - if you're using Chrome, I wouldn't really be surprised, it's a RAM hog.

Equally, it CAN be malware if you're having unexpected usage. So wouldn't hurt to run malware/virus scans.

Are you actually encountering any specific performance issues that are concerning you?
 
Some games do suffer from low available memory. For example, Watch Dogs 2 complains about RAM, and Black Ops 4 (Blackout) stutters alot. I will try the virus scan, hopefully it works. Thanks for the advice!