Wireless work, Wired won't connect

Archived from groups: microsoft.public.windows.networking.wireless (More info?)

I'm using the MS MN-500 router. I had everything working, my two desktops
and my two laptops all connected to the internet and each other. I'm not
sure what I did to my main desktop, the one with the router hard wired to,
but it won't connect to the network. My other computers can see the main
desktop and even connect to it, but the main computer shows the network in
windows explore/mynetworks but when I click the + to drop down the connected
computers, it shows nothing. If I open my Broadband utilities, I can see my
other computers listed and it says I'm connected to the internet and
network, but it's not listed on the right were the connected computers are
listed.

I've tried updating the software and there is no updates available. I've
uninstalled the broadband software and tried to install it, but before it
completes it always tells me there was a problem, to check my firewalls and
reset the router. I've disabled my firewall and closed it, disabled my auto
protect virus scanning, my WinXP firewall is not enabled. I've reset my
router, unplugged everything, including the computer, reconnected everything
and then I can see the network and all the computers. The minute I try to
access them, I get an error that I don't have permissions and then all the
computers disappear, including the main computer (which I'm on). All along
all my other computers can connect to the internet wirelessly, and they can
connect to all the computers including the main computer (which says it's
not connected).

I am so frustrated, I could really use some advice.

Thanks
Carol