Hi,
Acer notebooks have a very strong security management utility.
An Acer owner should know about this security, at least enough to know how to find help with it.... if you or the cousin is technically not the OWNER I strongly advise you not to mess around- you can lock yourself OUT and it would take a total reformat and full reinstall to set it straight.
Our site does not allow help with removing passwords or workarounds for lost or non-working passwords, etc.
Acer support pages for Aspire 5520 notebook
http://support.acer-euro.com/drivers...k/as_5520.html
What I will do is point you to the location where you can get the user manual for this notebook model, in it it does explain about Acer eManagement which I think is what you are running into here. Read the manual. Or, ask Acer support for help.
I will also have to Close the post.