I'm not quite sure if this software will work on such a large HDD, but have you ever tried EZ-Drive? You can also look for MaxBlast which is an OEM relabled EZ-Drive software that shipped with Maxtor hard drives. What it does is create an overlay that bypasses the BIOS limitations. I would send you a copy, but alas this modern day PC doesn't have a floppy drive (damn modern day non-legacy supporting PC's grrrr!)
Alternatively you can buy an ATA-xxx (xxx denotes the ATA speed of the hard drive) adapter card that fits in a PCI slot. Those also provide large hard drive support for systems with BIOS limiations.
