Boot to XP and then insert the Vista DVD. After a few seconds a small
install screen will appear. Click the Install Now button. Follow the screens
and then choose Upgrade. I have an illustrated guide to installing Vista on
my website. This, however, only covers a clean install, but it will give you
an idea of what screens should pop up.
http://vistasupport.mvps.org/install_windows_vista.htm
I was going to suggest that you could also install Vista onto another
partition and then have a dual boot sysetm where you could access, via a
menu, either XP or Vista, but i see from a prevous post that you are having
problems with partitions so until you have sorted that problem out it is not
wise to try installing on a separate partition.
If you want to re-install XP then you will need the XP CD or recovery disks
(if you pc manufacturer supplied these instead of a retail copy of XP) For
re-installing XP you will be doing a clean install (assuming you have a
retail copy of XP instead of recovery disks). details of a clean install of
XP can be found on my other website at :
http://xphelpandsupport.mvps.org/how_do_i_install_windows_xp.htm
--
John Barnett MVP
Associate Expert
http://xphelpandsupport.mvps.org
http://vistasupport.mvps.org
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