How can I get my second SATA DVD burner to work?

I installed two SATA DVD burners (Lite-on iHAS 22406)in my HP d530 CMT. Only one of them will work at a time. The CD ROM drive that I took out was IDE. Both SATA terminals were unoccupied. Windows XP gives me a code 42 error in the device manager. “Duplicate device” is already running, cant activate the driver. “My Computer” indicates no D drive device is presentat all.If you unplug one of the burners the other will work fine. What is the solution to this problem? I’ve tried the Microsoft fixit utility – it says that it cannot help.