Ok so assuming your motherboard has sata and IDE connectors this is how I would go about it. Unplug the IDE drive and plug in the sata drive. Put in the OS disk and select the optical drive for boot priority then install the OS. Once that is done turn off the computer and plug in the IDE drive then boot up. Now move any files yo want to off of the IDE to SATA and then format the IDE via disc management to get rid of the windows installation. Make sense?