Hello.
If the game is currently installed on a computer you can find the serial numbers within the windows registry. If you choose to do this just be very careful to only click on the needed items and folders.
If you have windows XP click start, then click run. Type in regedit and press enter.
For windows vista and windows 7 click the windows icon in the bottom left and in the search bar type in regedit and press enter.
Double click on HKEY_LOCAL_MACHINE.
Double click on Software
Double click on Electronic Arts
Double click on EA Games
Double click on Sims
Double click on Sims 3
Click on ergc
Under data in the column that comes up your serial key should be listed.
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