@sarahmousebeanz I've moved your post to the Sims 3 board.
Unfortunately, you cannot re-register games. If your friend is willing to, she could give you her account details and then you simply continue to use her account instead.
You can purchase new codes from support for $10 if you would wish to: http://eahelp.ea.com/en/ . For help with navigating the site, see this: http://answers.ea.com/t5/Beta-Archive/How-to-contact-a-Game-Advisor-using-the-new-EA-Help-page/m-p/2161281
I just want to add that you will need a base game to play those two expansion packs.
