100% Disk Usage

Any browser or file I open disk usage goes up to 100% and laptop freezes up (have to power off reboot). Lenovo T430 Win10-64, 8GB RAM, over 100GB free disk space. Ran Lenovo hardware diags, all OK. No conflicts in device manager. Taskmgr doesn't indicate an associated process but then also freezes. Ran Ccleaner cleanup and regfix. Rebuilt the windows.edb file. Ran full Bitdefender system scan. Last Win update a few weeks ago. What else to try? Don't really wanna run a system restore....
Thanks in advance!

 

I tried this fix https://www.kapilarya.com/fix-windows-10-100-percent-disk-usage-problem eventually it stopped happening.
The other thing with a laptop that is not on *enough* defender (AV) scans the system at start up causing issues like this, sometimes booting up and letting it sit for a bit the resources drop.

 

The SATA AHCI controller driver name I have is different (iaStorA.sys ) so I'm reluctant to modify the registry....

 

Chkdsk freezes at 10%, DCIM freezes, repair doesn't, trying restore point from last month.... if not, clean Win install.....

 

Too old to download a Lenovo Win10 install image for free.... running a recovery for 10 hours already....

 

Can't do anything without freezing, gave up, ordered new laptop.....