Awful Lag At The Menu and In Game???

During a recent sale I thought I might pick up battlefront so I decided to download the trial version to see if there were many servers and such. The game started up fine, ran fine, and I connected to servers fine so I made my purchase. However as soon as I started up the game after buying the Deluxe Edition I got at most 3fps in both the menu and in game at the lowest settings even. The trial ran just fine at medium settings for me...My cpu usage also went up to anywhere from 91%-99% usage. When playing the trial my usage was anywhere from 50% to 60% about (My cpu is am FX-6300 overclocked to 4.2ghz). Not sure whats going on but I would love to actually play this game that I bought. Any help on how to fix this would be greatly appreciated.