ignore the cd, temporarily,
try to connect to the router via its web interface at
http://192.168.0.1
the wizards and helpscreens on the router if you can reach it are very good
the default admin name is admin password blank
which the wizards ask you to change once you get started.
For guest, check the settings on the macbook,
it may be configured to always ask for password,
a blank password may be valid
it may be configured to login to a domain, which it cannot find
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