I have been running a machimne based on an Asrock K8 upgrade perfectly well for some time. The board has a block of 4 USB ports at the back- two of which are now giving a cannot start code 10 error. I only ever use one port & no changes have been made. When the PC starts up it waits a coupleof minutes while it is searching for these devices. I can disable them but I would like to know what the problem is ?