Since I don't know how the DVD's are structured, I would say yes, you would need all 3 regardless, but.. give it a try?
Thanks for a speedy response. Once booted the Acer eRecovery app has an option to reinstall "only the OS and to preserve user data" That DVD has 3.5 G of data on it so I am curious. I should just try it I suppose.
Maybe someone with an Acer could comment also...