with iPC 10.5.6 3 different computers PLZZZZ

I have three computers i'm interested in installing leopard/snow leopard on . i've downloaded and burned ipc 10.5.6 on a dvd. and i have a snow leopard retail iso on my computer.

the specs

Computer 1 : from cpu-z

Computer 2 :

and

http://h10025.www1.hp.com/ewfrf/wc/documen...product=18… ↗

Computer 3 : laptop hp dv9000z

i've only tried ipc on computer 2 and 3 . and my results are as follows

computer 2(used ipc 10.5.6 burned to dvd) : i was able to get to the installer and all, it didn't detect the internal HDD which i have xp on as u can see in the screenshot, so i put in a 2.5 usb hdd i have in an enclosure and it detected it , i formated it to hfs+ journaled in disk utility, i reasearched a lot to see what drivers i have to select, i wasn't sure what i chipset or graphics to pick so i didn't pick any , i picked the 882 for audio and 10/100 for the internet, all the apps , voodoo, and the usb fix i think , it installed and all in abt 20 minutes, restarted and it just went to windows xp that i have on the internal HDD, i tried to boot into the USB hardrive but it didn't work and booted to xp .

i tried installing again doing everything the same except for not picking voodoo and picking the intel chipset and a nvidia driver , i don't recall the name but it said it suppourted all geforce 6,7,8 drivers. no success, same thing happened

for computer 3, the laptop, same dvd:

didn't get to the installer , i got to this

extended

PLZ PLZ help me , any more info u need, i'll be willing to provide, Thank you

ps: no i didn't try anything on my first computer, its what i'm doing all my work on , such as this post, so i don't wanna accidently do anything and wreck it, i wanna make sure i can do it first .