Tried that, clicked on the check button. Report back is all O.K. in
the boot.ini window there are two strings, one for C drive and one for
D. We would like just to use the defaulted C drive and delete the
other one.
That indicates there are two installs of XP. To get a clean install of
windows you needed to delete the partition and then install.
Will both of them boot into windows? If so then boot into the installation
you want, then rename the Windows folder for the other installation. Wait a
week. If all is well then delete it.
You should also edit the boot.ini file in the root of the drive that's set
as first in the BIOS boot order to remove the reference to the unwanted
installation. See this link, and if you need help post the contents of the
boot.ini file in a reply here.
How to edit the Boot.ini file in Windows XP
http://support.microsoft.com/kb/289022/en-us