Thanks for the reaction Terry,
I`ve removed all the USB devices but it keeps the same problem after restart 
and redetecting.
Strange enough there are no yellow exclamation marks at all USB devices,so 
they look OK.
The only yellow exclamation marks I have are: ethernet-controller / 
PCI-modem / SM-Buscontroller.
So I`m afraid I have to try to get some Toshiba drivers to fix it.