Toshiba laptop c55-a5310 purchased used and when i turn it on a blue box pops up and asks for password

[Hreyna]

I purchased a used laptop, and when i power it on, it asks for a password in a blue box with white letters

 

[1shado1]

http://www.tomshardware.com/forum/id-2317969/read-passwords-lock-codes-pin-numbers.html