HT201240 A spiteful ex has got on to my mac and put a password on so I cant get in to the computer. How do I sort this problem out?

My ex chap has got on to my mac whilst visiting his daughter and while I was out he has put a new password on the computer.... How can I get in and will I have to lose everything.  I am not very good on computers I am actually a complete dummy when it comes to computers so I have no idea about anything..... please help
Thanks
Kirsty

Do you have your CDs that came with your Mac, an upgrade CD, or USB thumb drive (10.7/10.8)?  You can reboot the computer while holding down Option, select the restore disc (CD or Thumb drive).  Let the computer boot.  Go to Utilities>Password Reset, and you can reset your password without loosing any data (to my knowledge).

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