I can't install Ubuntu because during the "copying files" my PC powers off.
I've downloaded Ubuntu 14.04 with WUBI on my Windows 8.1 32-bit PC. I made a new partition with 15.9GB, (I don't know if I need more memory on my partition) Then WUBI, correctly, reboots. But then when it gets to "copying files", the computer powers off.
Before it shuts down, it looks like this.
