|I agree, why not ask the former owner for the password? What kind of gift is that?|
The best thing you can do is read the owners manual for exactly how to return this to the as bought state. Dell offers many ways to do that including the ability to purchase new media in some cases for a small fee. Contact Dell for more help.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.