I have Googled my fingers to the bone regarding this problem, and low and behold I am among many that have exactly the same problem.
As you instructed, I went into device manager and uninstalled the network adapter, I then downloaded a new one following the instructions, ie Action, adapters, Microsoft, adapter ... I then saw the window showing the download.
Rebooted computer and no change!!!!
Still the same problem can't see any ISPs to connect to and the listing is still not there under network adapters in device manager.
I downloaded the wireless utility from the Fujitsu site, although I'm sure that was OK anyway.
Needless to say I'm still using the Belkin plug-in, which automatically connects when I boot up.
Next question ...If it downloaded the Legacy Hardware, where is it and why isn't it showing in the listing?