This advice is correct, and you probably found the correct option for enabling USB keyboard support in DBAN.
The DBAN 1.0.x releases requires that USB keyboards remain in legacy compatibility mode. If the change won't stick until the DBAN blue screen starts, then start DBAN at the black...
The computer is crashing and rebooting into Microsoft Windows. This is usually caused by bad memory.
Download the Memtest86+ utility and run it on this computer. DBAN will not run reliably if the memory diagnostic reports any bad lines.