|I don't know if this is related to you problem but I have a home network with 5 computers. Three run 24/7. One is Windows 7 ultimate. The other two 24/7 units are WinXP home.|
I have had to reset my router a few times due to the same issue you have. I don't know why things should be any different when using Windows 7 but I didn't have that problem when I was running WinXP on all 3.
ATry going to control panel> Network and sharing center> Troubleshoot problems.
Or just try setting up a home network on the same screen.
Because I only have ONE Windows 7 machine I didn't bother to investigate the advantages, if any, of using HomeGroup.