The external USB DVDRW drive is indeed optional. It's like a car without a spare tire. You only need one when you need one and it appears you need one. About 35 bucks around town.
My notebook says to install a copy of the file windows root system32, problem there is no where to insert a disc and I can't get any further then this message, any ideas out there what I should do, computer is almost 4 years old.