Please help!
My Dad decided to install Windows XP Professional over his XP Home Edition. Everything was fine until the setup reached the section where it installs devices. It begins installing, stops, and the computer restarts back to setup. The entire process occurs again, and again, and again. The setup does not continue past the "Install Devices" section.
No matter what we try to do, from booting it from a floppy or the CD, or even running it in safe mode, it will pop up the Windows XP Professional logo and then promptly return to the setup screen.
My Dad did not make a copy of his hard drive, and I'm very concerned about that because we have very important documents on there. We cannot reformat the hard drive and start over because of this. When we began the installation process, we chose the installation to be an update, not to delete everything.
What can we do??!

Any advice is very appreciated!