Hello, yes I've done that up to Step 8, where it say,
"Type the following line, and then press ENTER (where CD-ROM drive is the letter of the CD-ROM or DVD-ROM drive that contains the Windows XP compact disc, and drive is the letter of the drive on which Windows is installed):
expand CD-ROM drive:\i386\vgaoem.fo_ drive:\windows\system"
The thing is, to enable the mentioned command, I must set the allowallpaths = TRUE command first. However the set command to actually enable it is disabled, and can only be accessed in Group Policy in Windows, which I can't go in now!