Hi,
There is a general policy on the Forum not to provide methods to bypass Windows log-on passwords, however a local computer shop would be able to do this for you.
Another option would be to reset the notebook to its 'Factory Condition' and then set it up from the beginning again – if your son hasn't created Recovery Media yet, the notebook will also have shipped with a Recovery Partition which can be accessed at boot - ie shutdown the notebook, then start tapping away at f11 as soon as you power on.
A full guide on this procedure can be found on the following link.
http://support.hp.com/us-en/document/c04758961
Regards,
DP-K
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Windows Insider MVP