You should do as furballi suggests, will do no harm, it will reinstall the drivers and correct any conflict that may have existed.
Do you know how the Sony is set up? Device manager doesn't show you exactly what is set up on the ide drives. There are two channels on the primary ide cable, 0 and 1, 0 is the master and 1 is the slave. The same holds true for the secondary.
To simplify matters almost all new devices these days rely on DMA and not PIO, in device manager just check and make sure that both in the primary ide and secondary ide channels all boxes indicate "DMA If Available", and that "Auto Detection' is enabled for all four devices. You will be able to tell if there is something connected under "current transfer mode". If a device is connected it will indicate Ultra DMA Mode 5 or Mode 2 etc. If nothing is connected to the cable it will indicate not appilcable.
I may have not described this properly, to summize, there are usually 4 ide channels that can handle 4 devices. Primary channel and secondary channel, each channel with 2 devices, a 0 for master and a 1 for slave. If you see all four are set to enable DMA then this is not your problem with the Sony.