No Windows old folder. I deleted that long time ago. What is strange is that I was using Windows 10 up until a couple of days ago. Had an iPhone crisis and had to go back to 8.1.

Hello to all. When I try to install Windows Ten over 8.1 on my Dell Xps 8500 it gets stuck at the welcome back screen.
After I go back to 8.1 I get a small box that shows.

0XC1900101-0x40019...