Before using the sims 3 store you need to delete all your browser history. This includes IE even if you don't use it . You can download CCleaner. It's free https://www.piriform.com/CCLEANER
You will see cleaner to your right and applications to your left. Click analyze and then run cleaner to clean all your browser history
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You will see cleaner to your right and applications to your left. Click analyze and then run cleaner to clean all your browser history