We just installed a new 120gig HD. it is set for the master device on the primary IDE controller. The original 15gig is set as the slave device on the primary IDE controller. There is also a CD as the primary device on the secondary IDE controller. We installed XP pro and set the entire 120gig as one partition. it all seemed to be ok until the reboot. XP has the the 120gig drive as drive letter E:, the CD rom as D: and the unformatted 15gig drive as C:. How do we make the 120gig drive to be C:?