SP2 has a built in firewall, try turning that off if you haven't already. Have you tried searching for the computer (start -> search -> computers) to locate it that way? otherwise try accessing the other comp. directly like this: start-> run

\\192.168.0.1\c$

192.168.0.1 is the ip address of the remote computer and c$ is the default share...

you have to have a password enabled on the remote computer otherwise it will deny remote connections. use the password you have on the remote computer to login to it.