Re: Hi I bought a second hand SIMS 3 pc game from a pawn shop.

Which edition is it ? Hee's an overview of the existing ones: http://sims3.crinrict.com/en/2014/02/sims-3-base-game-versions.html ?

If you have the old one, you can just install the game without registering and play that way.

If it's the newer one, take it back to the shop and get your money back.