media disconnected simply means that the NIC was unable to succesfully link the connection. If this is a wired NIC, then check the cable make sure its plugged in properly. If the cable ends appear to be damaged, replace the cable. If the cable looks OK, try plugging the cable into another switch port.
If this is a wireless NIC, check to make sure that your computer can "see" the wireless network and you provide the correct authentication password (for WEP and WPA).
I would also, make sure that you have the correct drivers installed. Check the vendor's website for the latest drivers, uninstall the device from device manager, recan for new hardware, provide the updated driver during the instalation wizard.
JorgeM
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