i have a similar problem...
recently i bought a wireless network card so i can connect my notebook and desktop together P2P. I am able to get a connection but thats where it ends. Cant share files, cant ping, cant do anything with eachother..
I used static IP addressing cos i dont really need ICS on my notebook.
Desktop IP: 192.168.100.1
Notebook IP: 192.168.100.2
Subnet: 255.255.255.0
Workgroup name is same on both comps.
My firewall software has been turned off on my desktop and i havent installed anything on my notebook.
Now on my desktop Im able to see the notebook in network places but not on my notebook.
When I try to ping each other i just get a request timeout.
ping Notebook 2 desktop = request timeout
ping desktop 2 notebook = request timeout
My notebook is running win XP Pro and my desktop is win 2000 Pro..
Ive tried uninstalling networking on my notebook but still not working..
But im pretty sure its my notebook problem because networking doesnt even work on an ethernet LAN