How can I downgrade to XP correctley?

I have ordered System Recovery disks after not being able to
setup it up via Startup \menu.
So my HDX16 is taking a vacation for a while..
So I'll ask help.

I had been searching days how to dongrade from Vista to XP.
It gaves me a blue screen all the time after finishing XP.
So I search deep into the core how to get rid of that bollox.
I finnaly got the right SATA drivers.
There is no option to disable native SATA or something that way.
So drobbed the drivers into floppydrive.
Tried again with installing XP with pressing F6.
Selected the right driver, it comes its end.
I had to select where I want install XP.
Alright, its installing there.
Then XP needs a reboot.
After rebooting and the HP logo, error appears as
"Error when loading Operting System"

I have no clue why it happen.
I did anything as said on many tutorials.
I used the nLite'ed XP and original XP.
But that error still appears.
Did I missed something?
Do I need set the right settings or setting the option in Vista?

Before installing XP I had resized the partition.
C: is for Vista and X: is for XP.

Thats all the information I can tell at the moment.

 

Once vista/windows 7 is on a disk you need to secure wipe it before being able to put xp on and that is if you can find all the wireless/graphics/sata drivers etc. tbh why not just put on windows 7? it is a lot less hassle and a lot better than vista/xp.

 

Well, I dont have Windows7 and I wont bother.
Now it seems the recovery disk has been nonfunctional.