This will teach you how to Dual Boot Windows Vista & Windows XP(With Vista Installed First)
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I have no responsibility for your actions using this tutorial, so attempt this at your own risk.
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How to Dual Boot Windows Vista & Windows XP (With Vista Installed First). Ben Staker © 2008
Things You'll Need:
Windows XP Installation Disc + serial
Windows Vista Installation Disc
EasyBCD (download it here http://neosmart.net/downloads/software/EasyBCD/EasyBCD%201.7.2.exe )
.
Make sure you save EasyBCD onto a Pen Drive.
Atleast 60GB Hard Drive
Creating a partition to install Windows XP onto:
Step 1)
Go to start and go to run. Then type in 'compmgmt.msc', and click enter.

Step 2)
Click on disk management, on the left side.

Step 3)
Right click on your desired partition to shrink, and click 'shrink volume'. It should atleast show half of your hard drive space, depending on how much space you have got.

Step 4)
Make sure you can shrink it by atleast 15Gb (15000Mb)
if you cant folow these steps:
Be patient, this may take up to 3 hours, depending on how much disk space you have used. After it has finished, reboot your computer, then try again.
If the problem still persists, delete some unnecessary filesthat you dont really need, then defragment your hard drive again, reboot the computer. If you still cannot shrink it by 15GB, Email me on bass-2k8@hotmail.co.uk and explain your problem.
Step 5)
You now have an unnalocated space/partition. Now we need to format it so...

Installing Windows XP onto partition:
Step 1)
Insert your Windows XP Installation Disc, and boot from it.

Note: get your product key ready.
Step 2)

it will ask you to prepare Windows XP to run on your computer.

So just press enter.

So just press F8, to accept it.

So highlight the partition you want to install it on, and press enter.

So highlight 'Format the partition using the NTFS file system (Quick)', and press enter.
Step 3)
After it formats the partition
it will copy the setup files, and then reboot.

Step 4)
Now Windows XP will start to install the Operating System, using a Graphics User Interface (GUI).

Note: Menu's will pop up asking you to...






So just follow the on-screen instructions, and you should have a succesful install.
Step 5)
It will now restart, and start to boot into XP.

You can now take out your disc.
Step 6)
It will pop up saying 'To improve the appearence of visual elements, Windows will automatically adjust your screen resolution'.

So just click ok.
Step 7)
The Welcome screen will load up first

which will spend a few minutes setting up your computer.
It will do the following:



And thats it!, you have Windows XP on your computer along with vista.
BUT.. were are going to have to configure it to dual boot Windows XP & Windows Vista.
IMPORTANT: Install Easy BCD onto XP, as soon as you log in.
Configuring Windows to Dual Boot:
Step 1)
Boot from your Windows Vista Installation Disc
Step 2)





Step 3)
If you want to remove either one of the OS's and get rid of dual boot, just contact me on bass-2k8@hotmail.co.uk
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Thank you for using this guide, and i hope you liked it :D
If you have any problems Email me on bass-2k8@hotmail.co.uk and explain your problem.
As you can see, i have copyrighted this guide, so no-one can copy it.
Ben Staker © 2008