Why won't my NEW Sims 3 disc work?

So I lost my old sims 3 disc about a year ago, So I decided to buy a new one yesterday. I came home and uninstalled the old one and tried to install the new one but my computer can't seem to read the disc at all! Nothing comes up. I tried it in my brother's computer and it was fine even with the expansion pack which i bought too. What do I do? Why won't this one work? Obviously my computer is compatible since I had the game before.

Thanks for any help :).

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