I've lost my Serial Code for The Sims 2 Double Deluxe

Hi,

I've had my Sims 2 Double Deluxe for quite a while now and haven't played it since before I had my kids, I wanted to put it on my laptop and get back into playing it during my free time but I can't find my serial number. I've looked everywhere and it just seems to have gone missing, can somebody please help me or tell me a way I can find my code again. I know that with every Sims 2 or Sims game for that matter, has a unique code so I'm not going to searching around on the internet for some code that won't work. I just want to figure out what my own unique code was again so that I can get back to enjoying and playing the sims 2 again.

If anyone can help me, that would be great.