First, if it's an SD or other flash memory card (from a digital camera, for example) then make sure its write-protect switch is set to allow writes:
If that doesn't solve the problem, then check to make sure that writing to USB devices isn't disabled in the Registry.
See: http://www.ghacks.net/2011/03/18/how-to-enable-write-protection-of-usb-devices-under-windows/
look in printers and devices for your device
if it has a yellow triangle with exclamation mark
remove device and its entry should disapear
see if another device entered into usb port gives same result
PS: May I mention I dont know much about computers but am working on a problem which may be similar to yours hence this reply