NT Setup Issues

I’ve tried installing NT on a few PC’s in stock recently and I get errors once it gets to the point where it starts coping files. I have had this on a few PC’s and my Usuall idea is HDD, CD-Rom or something along those lines, but I swap out everything and it still doesn’t work. I’ve used different different HDD, CD’s and CD-Roms. It seems to work on some boxes but generally not. This doesn’t happen with every PC just some and these few can still work fine with 98??? Help would be appreciated