Config squid for Windows with basic authorization, but squid still denied access after I input correct username/password

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http://serverfault.com – I installed squid-2.7-stable8 for Windows, try to let only authorized user can access the internet. But unfortunately after I entered username/password in client browser, squid still return HTTP 403 Access Denied error (configure was done and squid was restarted). What am I missing? file c:\squid\etc\squid.conf (use the default one with the following modification) # this is the first uncommented line include ../etc/squid-acl-cm.conf #... the default minimum settings # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS include ../etc/squid-http_access-cm.conf # Here, I disable (HowTos)