You could do what patio has suggested. I personally would buy another sata to be a slave drive. That way you wont get any hassel. Then once you have burn your files to disk you could then copy them to the new sata hard drive. Or you could try what what is written below.
First of all, make ure you have the IDE hard drive disconnected (don't have to really do this, but if having difficulties, it helps)
Then, go in to the bios setup menu and make sure your SAta is enabled in that area. (not raid sata)
While in the bios, go to the Boot section.
Make your boot order like this:
CDRom - 1st
Floppy - 2nd
Hard Drive - 3rd
Then, scroll on down in that same section to Hard Drives and make sure your Sata is set first in that area.
Then, make sure you have loaded Sata drivers from either the motherboard disk or even the drive manufacturer's disk.
Next, put the OS disk in and fire her up. At that time, look for the little prompt at the bottom of the screen that asks for either SCSI or other drivers and it says to tap F6. Tap F6 at that time and wait until it stops.
Then, put the floppy in and let it load those drivers. When done, remove the floppy and away it should go.
When it is done loading the OS, then hook up your IDE hard drive and repeat the bios setup area about hard drives to make sure the Sata is listed first, because most board default to the IDE drive. Be sure to save when you exit....and everything should be wonderful....well, I hope anyway.