Name resolution failing unless network adapter is re-installed

I've unchecked "Allow the computer to turn off this device to save power". Will report back here with the results. Thanks.

The name resolution problem happened again this morning; I could access the other PC by IP address but not by computer name. To clarify: I could see the shares on the other PC if I used its IP address but could not access the other PC by its name; attempting to do so produced the following error:

Windows cannot access \\PC05
Error code: 0x80070035
The network path was not found

NetBScanner displays PC05, with the IP address.

I figured I would try a trace route to the IP address. It found it immediately, but with the computer name of PC05.lan -- note the ".lan" suffix! What's that all about?

After I uninstall/re-install the NIC, I can access PC05 (including its shares) by computer name again.

BTW, when I browse to \\PC05.lan (either before or after uninstalling/re-installing the NIC), I'm prompted for credentials.