Have you checked your processes that are taking up your CPU? Your PC may still be downloading and installing updates and patches since it's a new install.
I also ran a malwarebytes scan, but after cleaning, nothing changed...
Thanks for uploading your task manager, but it's not in CPU task order. Could you click the CPU percentage to see what it application/task is taking up your CPU and send a picture of that? Thanks!
I think i may have fixed it- idling is down to about 4% and stuttering is gone. I uninstalled a 32bit java, malwarebytes, and edited some things through winaerotweaker.