you have a space in front of "PcName" -- is that a typo? because that looks like it would cause a failure. you also don't say what method you're using -- smbclient from command line? nautilus file browser? konqueror file browser? There are several different utilities that will perform smb actions, learn which one you are using and give some details on what steps you are taking to get this error.
as a test, try
smbclient -L //pcname
to see a list of shares available on pcname