As per my experience XP won't boot with the new mobo......i also switched for this board a week ago and XP restats after the boot screen (don't remember if there's a blue screen though). Vista worked fine....out with the old drivers, in with the new and all's good. I personally haven't gotten to reinstalling XP as i don't use it anyways.
Apart from requiring a fresh install of XP, the only other possibility could be RAM troubles (perhaps voltage or dividers incorrectly set) so check that out too.