Downgrading Vista to XP

Hello,


Ok, I currently have WinVISTA 64bit. I am trying to down grade from WinVISTA to XP and im having a bit of problems. First off, I downloaded a xp iso and burned it to a CD with alchohal 120. Then I booted to my CD then it went through the setup and than came the bluescreen.
I thought it might be my drivers so I updated all my drivers and I came upon my mother board (socket 775 G33M) and I downloaded the VGA drivers for winVISTA 64bit and when I ran the installation it said that "My computer does not meet the requirmnets for installing the software" I then tryed to download live update, and it said that "my motherboard does not support this" I also remeber a while back I tried to manage my fan control speeds and temperatures and it gave me an error that was very similar.

Specs:
640 gb western digital hd
socket 775 G33M foxconn motherboard
2.4 ghz processer.
6 gigs of ram
evga 9800 gt
XFI - xtremegamer soundcard
Windows VISTA 64 bit


Can I please get some help on this? Is this a motherboard issue and what can i do to resolve this,
Thanks,