Security Message in Message Center

Our '01 is having 3 issues. I'm wondering what, if any, connection there is? Last week, went to start and a "Security" warning came on and it barely started. I switched keys and it started. Then the CD player said "Check CD" and continuosly tried to eject a CD when there was no CD present. Then the battery died. We brought it in and they said we need a new Theft Control Mechanism. Could this all be from a dead/dying battery? Do i need a new radio? Could a bad radio be draining the battery? I'm stuck.