Well...what is the origin of the disk used for the install?
Are we talking Microsoft CD...are we talking media from an OEM (HP, Dell, etc.)?
7B errors are quite common when some attempt installs, Google, 7B STOP.
Is this a SATA hard drive?
System manufacturer and model?
MyBooks...are external hard drives. I've not known XP to install on such, but there are those who claim it's possible, http://www.ehow.com/how_4853554_install-xp...hard-drive.html