Anonymous guest password Windows server 2003

Configurating WMS 9 in a Windows server 2003 std. sp1 I received this error message: "The plug-in cannot be enabled because the user name or password does not match the settings for the Windows user accoun used for anonymous guests."
How can I change the system password or restore in wms the one is actually in use by the system?
Thanks in advance.

 

 

 

 

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