hmm ajibe kar namikone..
kari be regedit ina ferk namikonam dashte bashe..
in kara ro ke kardi shoma bayad folder haye share shode har 2 pc ro toye
Network Places bebinin.
Mamolan "My Network Places" ro ke baz mikonin folder ha ro neshon namide, agar neshon nadad, just go to:
My Network Places/Entire Network/Microsoft Windows Network
and here u should see the name of your (GroupWork) Network.
I dont think u r doing anything wrong, but still cant figure out why it is not working, might be something to do with win xp (Win XP = Win Xtra Problem as they call it)