You are going to need to start your computer in safe mode and find the
XP drivers that will work for your motherboard manually from the web
(Assuming that there are any created for XP for that board)..
That blue
screen you keep getting is because you don't have the correct driver
loaded for something on the motherboard that it needs to boot correctly
and your XP install couldn't find it on the web to install
automatically.
Start
your PC and press F8 several times until the boot menu comes up. Then
select "Safe Mode with Networking".
Now start looking for your drivers here:
http://www.dell.com/support/drivers/us/en/19/Product/optiplex-780
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