I'm completly baffled by this, and unsure why its happened.
I've just formatted two of my computers, one is connected via Ethernet cable to the router, the second is via a wireless USB dongle.
They connect through a Netgear DG834GT Router/Modem
I have setup them both up to connect to my network, and they are both part of the MSHOME workgroup, i set them both up to allow print and file sharing. And they both see each other on the network when i select 'View workgroup computers'
But when i try to access the pc from accross the network i get this come up: Picture of Problem
None of the pcs have passwords setup on them, both boot up in to default user, which is an admin. And no settings have been changed on the router, they worked before the format, now this has come up, any ideas?