Mass Effect 3 slow menu startup - PC

Hey, I made a post a long time ago but I cannot find it. Recently, I bought the Mass Effect trilogy for the PC. I downloaded Mass Effect 3 as well as all of the updates and free DLC, then started the game up through origin. When the game started up, the startup clips go as they're supposed to but when the game starts, the screen goes down to maybe .5 fps. It's like the game refreshes every 2 seconds and works for maybe one before freezing again. The music plays as it's supposed to. When I press a key, it played the sounds as normal but the screen switches to the Normandy computer menu at the same speed. The "Authenticating DLC" window appears and it just stays there (I assume because communicating takes way too long). I've sat at this for 20 minutes at least and nothing has happened. I tried opening the game in windowed mode as well just to make sure it wasn't my computer and it wasn't. The game client is just running obscenely slowly and it renders the game unplayable. I paid for this game, so what can I do to fix it?