Adobe Activation Code

I bought photoshop and premiere elements a good couple years back now, using it on and off, and I haven't used it for a while. Every time I try open it, it asks me for the activation code, I have put this in numerous times previously, then rather foolishly lost whatever the code was written on, so I dont have access to it anymore. Is there any way anyone either at adobe or from my end that this can be recovered as I have purchased it and activated it before, but can no longer get in?

Much appreciated.