You can look for the three files on the 'active'  primary partition on
Disk0.  Easy to find is look in Disk Management.  The partition which says
'system' in the partition information (  ) at the bottom area of each
partition of the lower portion.  That partition is the one that the ntldr
file as well as the other two are on the root of.

The disk that is first in boot priority in the BIOS is the one that is used
for the MBR, which looks to find the 'active' partition on that drive to use
the boot record to initiate the call to the bootloader program (ntldr for
XP).

Disk management is located as follows   Start/all programs (programs in XP)
/administrative tools/computer management.  On the computer management panel
that loads (it will probably have to configure itself if this is the first
time) Disk Management is on of the items on the left panel.  Click on it
(will probably also have to configure).  The top area will list all your
partitions with the info in ( ) The one that says 'system' when you are
booted into XP is where you will find your XP boot files.  It will also be
the only active partition on the drive0.  The bottom section shows how those
partitions are laid out on each drive.

Boot records are loaded on the system partition.  This is the first drive
(0) in boot priority in the BIOS and is the active primary partition on that
drive.
If you have your 'XP' drive first in boot priority, the active primary
partition on it would be where the boot records are installed.  This is the
case whether you install the operating system on the "XP' drive or on the
'Vista' drive.  Either way they would be on the 'XP' active partition.
If you have your 'Vista' drive as first in boot priority as you have been
doing when installing Vista, you would write the Vista boot records on the
active primary partition of the 'Vista' drive.

If you change the active partition on your 'Vista' drive to the partition
you plan on installing your Vista on, either J or K per the notepad you
sent, then you will avoid any possible conflict with the paging file of XP.
While in Disk Management, right click on either partition in the bottom
section and select 'Mark partition as active'

Vista boot records and XP boot records can share the same partition, but the
boot partition record can only point to one bootloader.

Since you have decided to have the boot records for Vista on the  'Vista'
drive, after you have changed the active partition on the 'Vista' drive from
your XP system, per the above, change your boot priority to the 'Vista'
drive after your DVD drive as you are currently doing.  See if that gets you
back to being able to install Vista.  If not, do the fixmbr command I had in
the last post, while the 'Vista' drive is still first in hd boot priority
and then try again.

I don't have a partition to do a trial install of Vista on at the moment,
but if the picture you sent is from just after you select the partition to
install on, the problem could easily be due to trying to write the boot
records on the partition with no room as it has your XP page file on it.

You have XP currently installed and there is no reason that I can think of
to change any of the partitions you have currently set up except to change
the active partition on the 'Vista' drive.    Also remember you will have an
8 gig hiberfil set up if you have hibernation set in the BIOS and Vista
and/or XP for each system.  Glad to see you named your systems so you can
identify them when they get different letters in the various systems you
have installed.