Well, I'm about to do it. So thanks, and wish me luck.
Just for the record, I'm doing it this way:
1.) Use Compaq windows disc to reformat, and install drivers.
2.) Use Windows XP pro 64-bit to upgrade my home edition.
3.) Install, seperately, Windows XP pro (normal)
4.) Then download and install vpc and debian 'etch,' as per this forum's recommendations.