This process is frustrating. I went back to the Dell computer, and ran the home network wizard again. I specified a name of "MYDELL" and a workgroup name of MSHOME. The wizard seemed to run successfully.
Here's the frustrating part: after I finish the wizard, I go to My Network Place and click on the link for "view workgroup computers." The system tries to process the request, then gives me the message, "Mshome is not available. You might not have permission to use this network resource..."
Thry using NetBEUI on your network. Often works for weird network issues like this.
http://support.microsoft.com/default.aspx?scid=kb;en-us;301041&sd=tech