cant install

im trying to setup a computer for a friend and it takes a good 10 hrs to install (first sign). i get it to finally get to teh end of the install and it bsod on me..... how do i solve this? i have a new drive on the way but its a 500 gb hdd i dont wanna toss it and the bios recongizes it.

build:
phentom 2 quad 3.1 ghz
4gb ddr2 6400
gt 9800