Hi All.
I had the similar problem with my home networking. I resoled it yesterday. It was my first step in the networking. Maybe it will be helpful. I had one desktop with Windows 2000 Pro connected to Internet via linksys WRT54G router. The desktop has usual Ethernet plug-in. Then I bought a laptop. The laptop with Windows XP Home has both Ethernet and wireless connections. The process took 3 days. (I hate Windows XP after that). So:
Day 1:
Step 1. Turn on both computers as is. All network configuration AS IS. I create some shared folders on both computers and try to see it.
Both Ethernet and Wireless connections: Desktop sees nothing. Laptop sees nothing. (However Internet connection is fine for both computers)
Step 2. Create the account in Administrators group with the same name/password on each computers. Create the workgroup with the same name on each computer (I made something wrong on XP, I will explain it below).
Ethernet connection: Desktop sees the workgroup and Laptop here, however Laptop shared folder is unavailable. Laptop sees nothing.
Wireless connection: Desktop sees nothing. Laptop sees nothing.
Step 3. I should find more information in Internet. Let go to bad.
Day 2:
Step 4. I have found something. I sets “Enable NetBIOS over TCP/IP” on both computers and try again.
Ethernet connection IS FINE! Desktop sees the workgroup and Laptop here. The shared folder is available. The same for Laptop. I share a printer. (the printer connected to Desktop via parallel port). I add this printers to Laptop. Laptop can can print!
Wireless connection: Desktop sees the workgroup and Laptop here, however Laptop shared folder is unavailable. Laptop sees the workgroup, however when I try to click on the workgroup, I receive the message looks like “Network resource is unavailable”.
Step 5. I should find again more information in Internet. Let go to bad.
Day 3:
Step 6. I have found again something.
First suggestion was: “Disable simple file sharing on XP”. Unfortunately XM Home does not allow “Disable/Enable” that. Skip it.
Second suggestion was: “Install NetBEUI protocol”. I am not sure for a while. Skip it.
Third suggestion was: “Uninstall all protocols except: TCP/IP, File and Printer Sharing for Microsoft Network and Client for Microsoft Network”. I find the protocol named looks like “OoS schedule …” and uninstall it.
Fourth suggestion was: “Disable firewall”. Do it. Check again.
Ethernet connection is fine.
Wireless connection is the same as yesterday.
Step 7. I run network wizard on XP again. I select the different option described my Internet connection. And I find two connections the wizard (Ethernet and Wireless). At first time when I created the workgroup I selected Ethernet. (Ethernet was fine!), now I select Wireless. Oh my God! I have found the Workgroup for Wireless connection was not changed (MSHOME!)

. I change it and press Finish. Check again.
Everything IS FINE.
Conclusion: It is understandable for me, why one computer is in the different workgroups in the same time. May be it is more flexible… I did not try “Enable firewall”, however I thing it is not necessary to disable it, because my Ethernet connection worked fine with enabled firewall (See day 2).
Thanks everyone who posted the suggestion in Internet.
