"//192.168.1.1" would only work if they were sharing something, and "//192.168.1.1/c" only if they were sharing something as "c" -- as Lala said, make sure to not only have samba installed but the daemons running as well (smbd and nmbd, IIRC). This will give you access to-and-from (once successfully set up) one box to the other without problem.
-- Poetics
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