Uninstalling Vista is easy, just destroy all partitions on the hard drive
using a tool like FDISK, super FDISK, GDISK, etc run fromn a floppy (or
bootable CD) or DISKPART (run from CD, usually from ther XP CD). Many free
disk tools are available on the ultimate boot CD, available free at:
http://ubcd.sourceforge.net/
Installing XP might be a bit harder.
If this was an older PC, with IDE/ATA type hard drives, XP would likely
automatically configure everything. The worst that would happen is that it
would use generic drivers, and you migth have some reduced functionality in
audio or video or printer, until you updated the drivers. By the way, one
of the easiest ways to update drivers is to run XP update. Many are
available via Microsoft and these are usually fairly well tested.
But, you are clearly not getting far enough to run XP update.
The "blue screen of death" you describe can be caused when there are no
generic drivers, or the generic drivers are not close enough. For example,
XP has zero automatic support for SATA-type hard drives (nor SCSI nor RAID),
which most modern PCs use. For those you must hit F6 very early in the XP
installation process, then have the appropriate drivers on a floppy. Yes, a
floppy, not on a CD. A self-powered USB-floppy can be temporarily added, in
case your PC dis not come with a floppy drive.
http://support.microsoft.com/kb/314859
http://www.pctipsbox.com/how-to-remove-vista-or-install-xp/
http://pcsupport.about.com/od/operatingsystems/ss/instxprepair1_3.htm look
at screen shot for words about F6
http://news.softpedia.com/news/Install-Windows-XP-On-SATA-Without-a-Floppy-F6-47807.shtml
to avoid floppy
As for the source of the SATA drivers, they usually come form the
motherboard maker or from the PC-maker (if major brand, like Dell, Gateway,
etc). If they do not offer XP drivers, then you might be stuck with Vista.
Alternatives include:
(1) returning the PC and buying one with XP. Due to public demand, Dell and
some other PC makers have started offerring XP as an option.
(2) Try installing some modern version of LINUX. These usually come with
better automatic driver support than does XP. As a test, download the
KNOPPIX "live-CD or DVD", which will boot the PC into LINUX, without writing
to the hard drive. If you get to a desktop, more like a MAC than Windows,
then it worked. Note that there are several free installable variations of
LINUX, and even the commercial ones are far cheaper than XP. (Hint: Burn
an ISO file to CD/DVD using an option like burn-from-image in Easy CVD
Creator or Nero; never simply drag and drop an ISO file to a CD/DVD, or it
will not boot.) Links to KNOPPIX and LINUX:
http://www.knopper.net/knoppix/index-en.html
http://www.ubuntu.com/
http://www.opensuse.org/