More problems

[Coroloro]

I tried doing the same thing on my other computer, to see if the problem was fixed... it was, but instead it was replaced by yet another problem. It started to write to the disk, then on each disk, it would stop short and say "Error on drive A: DMA crosses the 64K boundary". So... what is this, and how do I get on from here?
THankyou deeply for your help!

-Pat