Ok, I now have the ntdetect.com file on my USB and I try it again and now I have an error 19 - cannot mount selected partition. It comes up with Booting 'First part of XP setup from partition 0' root (hd0,0) Filesystem type is ntfs, partition type 0x7 map --mem /Winsetup/XPpSP3.ISO (0xff) Autodetect number-of-heads failed. Use default value 255 Autodetect sectors-per-track failed. Use default value 63 savedefault2 Error occurred while savedefault map (hd0) (hd1) map (hd1) (hd0) map --hook root (0xff) Error 19: Cannot mount selected partition Press any key to continue