Ok I will give you some steps to reproduce the problem.
First Create an folder at C:\ named Test.
Second open the program with a button nammed "share folder" with the follow code NewShare('C:\Test','testShare$').Acl.SetFileAccess(Everyone,True);
Now go to other computer and try to access the shared folder by typing "\\computerName\testShare$".
Windows will throw an exception "Access Denied **"
Now back to the computer that has the shared path, simple rigth click on the folder "C:\Test", select "Sharing and Security" then just uncheck the option "Share This folder" and check it again, then click on "apply" button.
Now try to access the folder from the other pc, it will works !
Any help ?