Windows 7 Network Problem

With much playing around, I finally got my new Windows 7 computer to see my other two computers, a desktop and a laptop, both of which run XP. I had to rename the workgroup to match the one of my XP computers and I am able to see all the computers when I click on "View Workgroup Computers" on my XP machines. However, when I click on the icon for my Windows 7 computer, I get an error message saying that it is not accessible even though I have enabled all file sharing on Windows 7. On the Windows 7 side, I changed the workgroup name to reflect that of my XPs, but when I open the "Network and Sharing Center" in 7, I see no mention of workgroups, only a home group. Under active networks, it shows a home network, but not my workgroup. At the top, where the map is located, it shows my 7 computer connecting through the home network and then to the internet. If I click on full map, it shows the same thing, except the home network is labeled as just "gateway." However, at the bottom it shows my XP computers but says the "following discovered devices can not be placed in the map, but I am able to click on the icons and connect with them. Why can't I then connect to my 7 computer from the XPs?

I'm having the same problem. My Windows 7 machine can see and access my XP machines through the network. However, if I try to transfer files to the XP machine I often get errors. I can usually transfer or edit 1 file at a time without issue but moving more than 1 at a time is a problem. Even re-naming files sometimes does not work at all with access issues. I'm at wit's end with this. Both XP and Win7 are fully updated including LLTD on XP. Still having issues.