I am experiencing a similar problem with the same motherboard. Windows 7 64bit. Data transfer is horredously slow if it works and the system will completely freezes or sits in a transferring state indefinetely 9 out of 10 times a data transfer is atempted (cold boot required). The transfers are to any device (external HD, iPod, etc) via USB. I also have firewire and eSata ports on this board but I do not have any devices to test them on. Anyone have anything on this???