Re: My Game uninstalled itself
If your game has "suddenly disappeared" and your code is already registered, it most likely:
You're logged in with the wrong account. You may have several Origin accounts because you have your usual games on one, and are playing a Play 4 Free title on the other (NFS World, C&C Tiberium Alliances, etc.). Perhaps you've just used the wrong e-mail when purchasing your game. Try locating your account by searching for the purchase confirmation email in your various inboxes, and once located log back in with that e-mail address as the username. If you can't locate the e-mail, I suggest you try logging in with your various e-mails anyway: many people contacted me who had mistakenly deleted their purchase confirmation e-mail (not a good idea! 🙂 )
That's it. Now, go and check your e-mail inboxes!