Thanks Greg for the image! With the help of a PC friend I loaded the image onto a fresh drive, and when it reached guided setup I thought I was home and hosed. But I got the S02 error after loading 99% info. No amount of restart or days spent in the loop got past it. I read whatever I could find: common issue with no clear solution. KS76543210 was promising at first but led to looping at C&DE. KS54 passed the new drive. KS57 registered but didn't seem to do anything, but after a number of tries including getting a GSOD, I finally got through guided setup, and my Premiere lives!