It sounds like you are installing Sims 3 onto a new computer. Is this correct? If so, and you have the old computer still, fire it up, connect it to the Internet, go to
http://belarc.com/ ---> hover over the "FREE DOWNLOAD" tab, the drop down menu will appear ----> click "Download" on the drop down menu ----> click
Download Belarc Advisor ---> Click "Run" when prompted ----> Agree to the License Agreement ----> Click "Install."
In a few moments the Belarc Advisor report will generate. In this report, among other things will be a list of the installed programs AND their activation keys.
If the scenario of the old computer doesn't apply to you, if you've previously registered the software, you may be able to contact publisher and get your activation key.
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