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1.go to the computer with the share
2.download the Windows Server 2003 Resource Kit Tools and install it: http://go.microsoft.com/fwlink/?LinkId=4544
3.click Start, All Programs, Windows Resource Kit Tools, Command Shell

Then enter the following commands. (Attention: they are case sensitive.)

1.net user guest /active:yes
2.ntrights +r SeNetworkLogonRight -u Guest
3.ntrights -r SeDenyNetworkLogonRight -u Guest