I want to uninstall a game for ever

[Goafar]

I inadvertently created 2 Origin accounts.

All my Sims 3 base and expansions are in one account which I downloaded from discs, except for University which I downloaded through Origin into the other account.

As you can imagine this has caused some big conflicts in the game play.

I want to uninstall the university download from the wrong account, and install it from disc I purchased.

How did I create 2 accounts, don't really know, one I had Sims and Dragon Age and the other I found I had all my Mass Effect in.