Issue with new burners

I've been having a problem with the burners in my homebuilt pc. I just got 2 brand new DVD burners, (A Pioneer DVR-215D, and a Samsung SH-S203B) both SATA but they don't work. I plug the Pioneer in and then when the computer gets to the windows screen it freezes. The computer won't boot up but as soon as the pioneer is unplugged the computer works.
The Samsung is somewhat more tricky. The drive is recognized by the computer and it will even read cd's and DVD's. The problem seems to be in burning. Whenever I attempt to burn something (regardless of the program, Nero, Adobe, Roxio even with windows) the burn proceeds normally until the very end or close to the end when it says the burn encountered an error and then the disc is useless and cannot be read.

I RMA'd both drives after talking w/ Pioneer and Samsung support. Both drives are performing exactly as they did before I RMA'd them so I'm almost positive the problem does not lie with the drives themselves.

I have a Foxconn Winfast NF4SK8AA motherboard with an AMD Athlon 64 X2 4200+, 2 gb of DDR-400 RAM. I've never had burn issues with IDE Burners. Any ideas? Could the problem be with the chipset or SATA controller or something else?