pardon my intrusion, as dsenette is one of the most knowledgable folks around here, but I have a question....or rather suggestion. You are investing a lot of effort in ridding yourself of Pro to install home...what are you trying to "preserve" on this machine, since you are going to install Home? Why not back up data and wipe it out?
If you uninstall Pro and install XP Home, you will not be able to simply run all the programs anyway, since removing Pro will take some critical program files along with it.
Or are you just not able to back up a HUGE quantity of data, and therefore are trying to take a short cut?
If that is the case, I would simply drop the drive in a separate system, rename windows, program files, and Documents and Settings, then simply install Xp Home...after it is up and running, grab all the data you need and wipe out the old windows, program files and DandS....