Copy XP setup files to USB from DOS prompt

I have a HP laptop with no CDROM, no Floppy drive. I can boot with the USB stick but the notebook HDD appears as a slave drive (D:drive instead of C:\drive). I tried installing winxp but doesn’t boot with the laptop’s own HDD, it shows “missing file” error messages. How do I copy the installation files from my flash to the laptop’s HDD on DOS?