Yeah like these guys said, if its already part o the disc you wont get the option to install without it.. however if you ahve one of the older discs with just SP1 on it, no you dont have to install SP2... im on SP1 right now, myself and it works fine... i fi were you thoug i would install SP2 on a fresh install.. 9 times out of 10 you will experience better performance and a higher s stability than otherwise.