Stock system - code

I got my car last week and the battery died. I jump started it and its all good. But cuz of the anti-theft thing on the deck, I cant listen to the radio or cds or anything. It says code, so I enter the 5 digit code that my uncle told me to put in but nothing happens. I looked in the manual but this is all it says. "The Anti-theft feature disables the system if it is disconnected from the car's batery. To get the system working again, you must enter a code number." Help meehh.