end of wits - mac+pc

I am having problems with a home network. I am trying to
connect my pc w/ME to an imac w/panther. I was but no
longer am able to ping oe to the other. I also was but am
no longer able to share an internet connection (dialing up
from the pc) I have undone any progress in my fiddling
around with these darned machines. Can anyone please help
with the ME aspect of this? I have found many resources
w/xp to mac info, but no ME and I think that is where the
hang-up is. thanks