means the driver for that adapter is either corrupt or gone. Since you didn't tell us what that adapter is, reinstall it.
Adapter can mean anything from USB, sound, video, NIC, wireless card, etc.
have win vista home on gateway laptop built in wireless was connecting to net fine then not last thing I did was backup.
use qwest actiontec m1000 modem with w1000 adapter. qwest help went thru trouble shooting as far as device man which had 1 item showing little yellow thing on 1 adapter.