Apologies if this has already been discussed however I have been unable to find the answer to my problem. I am running Windows XP X64 on 13" MBP (unibody) mid late 2009... and have installed all drivers succesfully accept the Sound driver. Now i'm not sure what the correct chipset is however I am told it is cirrus logic or realtek? I have tried every variation of x64 driver and setups from both but I can't get this sound driver to install and work correctly. I have been wrestling with this issue for the last few days and have exhausted all avenues so any help from you guys would be very much appreciated.