I lost my regestration code for The Sims 3 game for my computer. How do I get it?

you can just google sims 3 starter pack serial and you will find the code

I doubt they will do anything about it but here is the support page for Sims 3
http://help.ea.com/en/the-sims/the-sims-3/
Otherwise you could purchase it for $19.99
The Sims 3 Into the Future Instant Access

Contact support and request a new activation code, you can not use the older one, because is already used, ask to resend a new activation code. Hope this help.

The only one who can provide you with a replacement code is Electronic Arts (EA). Go to their website and, in the support area, search for "lost registration code". There is a process to gain a new registration code, but you have to prove ownership of the game. It is illegal for anyone to provide you with a registration code on FixYa.

you can't you will have to contact electronic arts about getting a new code or buy a new copy of the game.

noone here can help you with registration/license codes. you will have to contact the developer. www.ea.com

Hi. Do you happen to register your game to the website of sims 3? if you did register for it you can actually download the sims 3 from the website for free without needing the registration code.

Hi,
This is unfortunately a problem we all experience at some or other stage. It would be easy for me to send you a working registration code to get your game installed. This, however, could have legal implications due to copyright laws set up by the game producer, namely Electronic Arts in this case. Your best bet will be to contact EA via their website and explain your problem and also submit all evidence as to prove ownership of the game.
Let me know what the outcome is so that I may assist you further if necessary.
Best wishes,
Graemevm

A lot of big computer games have official websites where if you register your game AND email them saying you lost your access code/serial number, they will send you another. (That's what Blizzard did for my Diablo game.) Hope this helps!

http://www.katzforums.com/showthread.php?t=405485 here you will find what you are looking for.