windows vista can t detect ethernet dcontroller in

-- Hello there,
My laptop is Toshiba M55 S1001, the entry level laptop. I tried to install Windows Vista and it work fine so far, the only thing is when I hit the device manager and it tells me that the Ethernet controller can't be installed correctly ( has a question mark) in device manager. It seems that I can't connect to internet if I can't install this controller right. Any idea I can't find a driver to fit this baby??

Thank you for you guys help, I do appreciate that,

Regards,