I am trying to network a Vaio 305 desktop connected via router with a Qosmio wireless. To date both are working off the same LAN for internet access and when trying to link the machines, the desktop can see files on the shared area of the Qosmio but the Qosmio is not showing the Desktop. I have tried setting up the Wireless network identically on both but always with the same results.
I have struggled with this problem! One solution often suggested here is to ensure your firewall is configured properly on both machines. If this is a problem, the shared folders on the newtwork should be visible and usable when both firewalls are switched off. If this is the case, see what happens when one or other firewall is turned on; this will isolate which firewall is incorrectly configured.
I've had the same thing for one desktop. Changing the desktop's software firewall to have the IP addresses used within your LAN added as being for "trusted" computers; 192.168.n.1 - 192.168.n.100 is the usual IP address range to be set.