System says device not recognize to all USB device on Vista

Please i need help,some weeks ago,i posted that my system toshiba A135 is having a freezing problem anytime i insert a usb device.i was using windows xp professional then.now i have changed to windows vista that is the orginal O.S that came with my toshiba.whenever i plug a device it doesnt hang but it says usb device not recognize ,unable to install device driver etc.pls i need some tech advice
 
Try this:
> Shudown computer
> Unplug computer power cord. If a laptop remove battery too
> Unplug all USB and other non-essential devices

Let is sit overnight

Now plug in, power up computer in the morning. When you reconnect your USB devices, if they have their own AC adapter
> USB device should be turned off
> plug USB device into AC plug
> plug device into USB port
> now turn USB device ON

is it recognized?
 
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