inaccessible boot device windows 11 - drive shows up as d:

I did an in place upgrade to windows 11 using a USB. It went fine and I was able to use my computer without issues. However when I power cycled the machine, it gave a inaccessible boot device error.

I went to BIOS and changed the Drive type to ACH, then ACHI but no effect.

I then got a command prompt and C: is some temp. structure and my real data is sitting on D: