eac forum, then there are a few things. the first is your cd drive, some are great some are not worth messing with. check the list and see if the setting for your drive are there first. if that doesn't work, lens cleaner. then defrag, scratch that start with that.
is the drive set for dma? do you have an sata MB? if so i would probably buy new optical drives(if that will get you to all sata) i try to check the reviews for ripping speed before choosing drives. maybe virus or spyware, have you tried spybot and such?