PangingJr

in the above example...

i did not configure to dual-boot between Windows and another Windows so the Windows OSes installation order should not be concerned.

starting from an empty hard drive,
boot your computer with one of Windows setup CD,
create a partition (the first primary partition of the drive), and leave rest of drive space as free space (as unpartitioned),
then install the Windows. the first Windows is installed, up and running.

then boot your computer with a third-party partitioning program boot disk,
create a new primary partition next to the first one, and leave the rest of drive space as free space,
set "Active" to the newly created partition, and also hide the other primary partition,
then boot your computer with the other Windows setup CD,
install the Windows. the second Windows is installed, up and running.

if you want to install another Windows then boot your computer with the third-party partitioning program boot disk again,
create a new primary partition, set "Active", and hide the other primary partitions just like before,
then boot your computer with the last Windows setup CD,
install the Windows. the third Windows is installed, up and running.

just a little bit info about the earlier hard drive partitioning... if you already have planned on what to do with your hard drive space, you can partition the drive in one step, even before you install the first Windows OS into the drive. just make sure that you have set Active to the right primary partition and the other primary partition must be hidden at before you begin to install the Windows each time.

up to a point where i like to note something about hard drive partition.
typically, one hard drive can contain up to four primary partitions,
or three primary partitions and one extended partition.
the extended partition can then be further divided into any number of logical partitions.

so in this example the hard drive already has three primary partitions.
the rest of free space will have to be an extended partition,
unless you want to use the rest of free space as another primary partition,
or unless you want to use a hard drive partition software like BootIt™ Next Generation.
BIGN has a unique feature which allows more than four primary partitions on one hard drive (over 200 primary partitions if desired).

final on the multiboot configuration for 2 or 3 Windows OSes...
after the last Windows has been installed you can now install one of a Boot Manager program.
(the Boot Manager should be installed after the last Windows has been installed.)

if you never use a Boot Manager program before and have Partition Magic program your can use the PQBoot for Windows.
otherwise, i'd like to recommend GAG. if you are interested in using GAG, then at the GAG program setting you will need to select the option that says something like Hide Primary Partitions and set up your Windows OSes boot menu and you're now all set.

a few useful infomations about the GAG...
GAG doesn't need its own partition,
it doesn't require you to install any of its program file to your hard drive's nor the MBR,
it can fully work from its unique self-booting floppy disk. you can also save your boot menu settings into the disk.

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E8400 @ 610 FSB
Q9300 @ 500 FSB
4x1GB DDR2-1333 (PC2-10666)

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Don't worry overly much about whether a specific KB article exists for your version of Windows.
Standard practice is to grab whatever's available and apply the principles.
(I grabbed from the web. Written by someone, somewhere on the web)