Sims 3 product code [ Edited ]

[sheryn123]

I recently got a new computer and I went to install the sims 3 expansion packs I had bought and it said that I needed to install the base game first but when I tried to install the base game it said that my product code was already used. I also have the Sims 3 on another computer and I used the same product code. Can I transfer the Sims 3 base game to a different computer using the same product code?  And if so, how?