I've carried out a clean installation of Windows 7 Pro 64-bit from Toshiba's restoration DVDs.
I now have wireless connectivity from the machine but no ethernet.
1. There is no ethernet adaptor showing in Device Manager.
2. The indicator lights in the notebook's LAN socket are showing when an RJ45 cable is plugged in and the router indicator light shows a connection.
3. I've re-installed the driver from Toshiba (tca0010800b.exe) just in case it was missed during initial install from recovery DVDs. The file executes but provides no feedback.
4. I've run SIW and PC Wizard 2010 hardware detection. Neither of these utilities show an ethernet adaptor.
I don't know whether or not the wired LAN worked before this clean install: I've never had occasion to use it before now.