cannot install XP!!! need urgent help!!

I have vista. I want to install XP. When i boot the CD and the setup is starting and the files are being loaded, i get this error:

STOP:C0000221 unknown hard error

\systemroot\system32\ntdll.dll 

If you want to go from Vista back to XP, you can't run XP setup in Vista.  You have to boot with the XP disk, format the drive, then proceed with XP installation.

If you ARE booting with the XP disk, and getting that error before you get to the desktop, make sure your XP disk is not scratched or dirty. 

If you are booting from xp disc, do this http://dban.sourceforge.net/ then install the xp disk.JigglyWiggly2

i dont want to wipe my HD! the partition i want to install it in has a lot of stuff in it 

[QUOTE="JigglyWiggly2"]If you are booting from xp disc, do this http://dban.sourceforge.net/ then install the xp disk.TheDarthvader

i dont want to wipe my HD! the partition i want to install it in has a lot of stuff in it 

I think you need an empty partition to install XP from vista.  

I think you need an empty partition to install XP from vista.the_ChEeSe_mAn2

[QUOTE="the_ChEeSe_mAn2"]I think you need an empty partition to install XP from vista.theragu40

But if he can free up a partition of stuff and completely clear it, he can reinstall to xp. 

Question: are you willing to delete everything on it? 

[QUOTE="theragu40"][QUOTE="the_ChEeSe_mAn2"]I think you need an empty partition to install XP from vista.the_ChEeSe_mAn2

But if he can free up a partition of stuff and completely clear it, he can reinstall to xp.

Question: are you willing to delete everything on it?

i can but i dont see how word files and videos/songs can hamper an OS installation