Things You'll Need
Instructions
Click the "Start" button on the bottom left-hand corner of your computer for games still installed on your computer with Windows. Click the "Run" command in the right column, and allow the box to pop up.
Type "regedit" in the Run box. Wait for Registry Editor to pop up.
Find one of the key files titled "HKEY_LOCAL_MACHINE" in the left column. Carefully click on this function without touching any other options. Click the cross sign to see the drop-down for "software." Be sure to only touch the left column, and do not enter any data into the right side of the registry editor. Doing so can be detrimental to the system.
Click the "Electronic Arts" tab below Software. Then click "EA Games."
Find the expanded box with all of the expansion packs and the original game listed. All of the Sims 2 games on your system will be listed here. Click to expand below the games you need your serial numbers for, and click "ergc." To the right of the screen in the open format, you will see the serial numbers to the game beside the game name.
Copy your serial numbers down manually--do not attempt to copy and paste them or even click on them in the right side of the screen. Then collapse the categories back to the way they originally were before you expanded them.
Click the serial number recovery link under Resources on this page if you've previously registered your game. Log in and click the "My Games" tab, which will have your registration code under the title of your game.