re: question about passwords and netflix

You immediately changed all your passwords, right? If you did, the new owner of your xbox will be prompted for the password.

I'd be more worried about your data on the PC than your logins. A regular joe won't be able to bypass your windows login, but your data is easily accessed if someone connects the hard drive to another PC or runs a linux live CD, etc. I doubt a dindu is interested in anything but pawning your stuff.