Windows 7 = teh awesome.
Now that this is over with, there's something that's more along the lines of "teh suck" because I am not sure why this is happening.
I have Windows 7 RTM on both machines (Ultimate - Desktop, Professional - laptop). I created a HomeGroup (side note, is it "Homegroup," "HomeGroup" or "homegroup?") on my desktop. My laptop threw an error, just that "There was an error setting up Homegroup" or something like that.
Now, here's the part where things get dicey (and this may just be an unsupported configuration).
There are two routers in the house. One is a 2WIRE 3800HGV-B which serves up AT&T U-Verse. Now, the problem is this house is about 90 years old, so it's not wired for "teh intarwebz." There's no cabling in the basement, so the only way to make this work is a Wireless Ethernet Bridge ("WEB"). This is where my Linksys WRT54G v. 1 comes in. It is running DD-WRT 24 (5/20/2008 std vintage).
So I have my network set up. The WEB is operational. I can see, ping and access files on one computer from the other. I can even send documents to the desktop's shared printer in the basement. That is, I can do all the "networking" activities that I'd want on a home network, except HomeGroup keeps throwing errors!
The DD-WRT's DMZ is enabled for the single computer behind it (my desktop) so it should be completely transparent...
Here is a something that will explain the variations of spellings of HomeGroup: http://community.winsupersite.com/blogs ... ained.aspx
Also, what firewall are you using? I've had problems with homegroups working with Kaspersky.