Hi,
From XP Pro, you can't do a direct upgrade to Home Basic but you can use the
custom install option (this is not an upgrade but an install to a new
folder). Unfortunately, unlike earlier upgrades in the Win9x line, there is
no longer any uninstall option. There are many technical reasons for this,
but suffice it to say that the option no longer exists. To go back to XP Pro
will require not just a format/clean install, but a rebuild of the
installation volume or partition due to the changes made by Vista to the one
that previously housed XP. The NTFS file format used in Vista is slightly
different than that used by XP, and XP setup will not be able to install to
it, though it can read it in a dual boot scenario.
--
Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Windows help -
www.rickrogers.org