Vista installation problem, possibly hardware related. please help!

Hey, I'm building my first pc, and the assembly seems to have gone fine but i'm having problems with installing vista. when i switch on, the computer seem to recognise the dvd, and i get to see the words "microsoft corporation" and a loading bar, after this (about 5 secs) a green windows-ish backgorund appears and the mouse cursor, which will move, but there it stays. there is nothing to click or anything, and stays like that indefinitely. its wrecking my head!

Mobo is an Asustek MSn-X AM2 nforce520, and using a SATA DVD RW

Is it 64 bit you are installing?
What are the full system specs?

yeah 64bit vista home basic,

Mobo as above, Athlon 64 X2 4400, 2GBDDR2 Ram, SATA 320Gb Rom,X1650pro, Antec 350w. could it be a bad disc? it doesn't even get to any options, just a background