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#31
In regards to workgroups and setting them up. If you set up your workgroup properly and join it with each and every computer, you shouldn't have issues with computers not showing up in the Network portion of explorer. There are exceptions, but it'll work 10 times better than trying to configure the Homegroup portion. Once you set it up, you can share files/folders with others in your work group by right clicking on the item and going to Share with...
7: Join or create a workgroup
Vista: Windows Fanatics
XP: Microsoft Corporation
Generalized installation instructions for your router:
How to Install a Belkin N1 Wireless Router | eHow.com
How to set up a WPA secured network on a Belkin Router:
Belkin : Support : Protecting your network with WPA/WPA2 security
Your settings in your router shouldn't effect your network, as long as you're not using any specialized settings.
PS... Make sure you're on a "Home Network" not a "Work Network". The work network will cause certain features to be locked by default.