We have a home network here, and it's been persnickity recently. Computers will work sometimes, they won't work sometimes, and it's just a general all-around pain. We've always used our computers to communicate with each other and shuffle around files; in fact, my laptop is completely backed up on two computers for safety.
As I mentioned previously, my dad just bought a new HP Media Center computer. We brought it home, and everything got set up beautifully . . . except filesharing. The computer couldn't access the workgroup. (it said "workgroup is not accessible. you might not have permission to use this network resource. The list of servers for this workgroup is not currently available." yeah, I typed that for the next person who has my problem and googles that string.) Agh. Screaming frustration. I tried the TCP/IP bios thing, and starting the computer browser service. No such luck.
Then I tried this cool regedit thing, because my computer (which couldn't access my dad's and didn't see the other computers on the network) had the node type listed as peer-to-peer. It worked for my computer, so I could see everyone on the network. Yay fun times.
Still, my dad's computer didn't work on the network; it still wouldn't access workgroups. What did I finally do to get it to work?
I uninstalled Norton firewall. Oh, heavenly day. Everything works beautifully now.
PS I also updated my router's firmware. I didn't know you were supposed to do that. It was actually kinda cool.
PPS my dad bowed to me. Woot. It only took me, oh, half the day to get the networking figured out. I guess I did clean up my room some while doing that, and we also cleaned up the entire computer room and set up my dad's old computer in there. Anyway, it's now a happy computer day.