Sims 3 Add-Ons; New Computer and now lost.???

Redeem Codes of 2 Add Ons for Sims 3 is not recognized; lost from my library once I started using my new DELL 16 - (I'm currently on my old computer, which has sticking keys, hence difficult to type); I have the disc and codes for my Add-Ons, and they were in my library originally-Please help