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#1
A shot in the dark: try booting into safe mode and flush the windows\prefetch folder contents. Reboot and retry.
On Superfetch:
Hi, here's a detailed article on Superfetch - you can try disabling it.
Fix: High Disk/CPU Usage by Super Fetch - Appuals.com
Recommend you take measures to make the changes readily reversible.
For interest:
Superfetch Causing Massive Disk Usage - [Solved] - Windows 10
Superfetch: Everything you need to know about it - Driver Easy
I suggest you do this at least for a trial period, as it's possible there's more than one problem. Eliminating superfetch should at least allow anything else to become more apparent.