I am really not a hardware expert, SATA, slave, ide are all names to me

....but the PC is only 4 month old so perhaps its SATA (since I hear its new)

.
I found the genuine, but it rendered an error also, when I goolged, some suggested that because the CD is old and isn't SP2 (it wasn't SP1 either)....
So I decided to get an SP2 (bootlegged)....it booted and got a step further than the original CD, but now there are no drives detected....
Could it be I burnt MBR? how could I know? and how do i retrieve it?