Laptop frequently freezing and CPU capped at 100% after a reinstall of windows

[NoTxtWhileDrive]

initially posted it in troubleshooting, posting it here just incase:

TLDR; I just reset Windows 10 after a period of showing a black screen after startup due to a Gpu driver problem. But after the reinstall my laptop is constantly at 100% cpu usage but all of the processes at Task Manager reporting 0% usage, as well as constantly freezing a few mins after starting up.

 

I been using my Dell inspiron 7559 (i5 6300/Gtx 960/8gb) running windows 10 for a long time until earlier this week where I can't use my Gpu in applications (but it still appeared in device manager although with a yellow triangle mark) I reinstalled the Nvidia drivers, but stupidly left the Integrated graphics disabled within device manager when I restarted. Starting a cycle of turning it on, just getting a black screen with just a loading symbol in the mouse- turning it off, and repeat.

 

During the process of trying to fix it I've: Cleared the CMOS twice, Setting Bios to default settings, Rolling back windows updates in the windows recovery screen, Finally somehow gotten it to boot into safe mode- reinstated the integrated graphics, and finally fed up going with the nuclear option of resetting windows. With hard shutdowns after freezing/blackscreen throughout the process. (Tbh I think constantly turning it off was a bad idea, and caused further issues down the line)

 

I think the constantly freezing on startup started after either rolling back windows updates or after getting into safe mode. After booting to safe mode to enable the iGPU I was able to get further in the startup process getting into the account selection but I was left with a forever looping Welcome screen upon logging in. Sometime in this stage I was able to Ctrl+alt+del open task manager and get into my windows desktop but it freeze as soon as I tried to do anything or by just waiting for a couple of mins. 

 

Right now I'm trying to backup all my drawings/documents and other files worth saving, incase of a full reinstall of Windows or full reformat of my boot ssd. I'm really hoping for solution so that it won't have to come to that. I'll appreciate all the help I can get. Thank you for listening and I'm eagerly waiting for your suggestion to my situation.