I thought you mentioned earlier that you were on vista? With xp corp you'd probably get away with doing a repair install from the xp disc over your present o/s then just add the via hyperion drivers for the new Asrock mobo.
No... I said earlier if I had to change the MB/CPU then I assumed I have to do a fresh install, and if I was to have to do that then I'd so it properly and take the oppportunity of putting Vista on a new (SATA) HD.