Look up the drivers for the controller and upon installation of the new OS press F6 for RAID/SCSI drivers, then use floppy drive or thumb drive to mount the hard drive controller drivers, and then you should be able to destroy all that data on that system, wipe it clean and turn it into a clean build.
Other easier option is install a new PCI Hard drive controller and use that to run your IDE or SATA drives and set that as the primary boot controller in the bios if you cant find drivers or a way to mount those other drives with F6 on install of OS from CD or DVD.
Hard Drive controllers are cheap usually $20 to $50 depending on brand and features.