I tried to change to a new graphics card which didn't work. I put my old graphics card back in but somehow things got messed with on my computer during the process. Right now I can't get the game to open. I had to redownload it and it acts like I'm using a free account but I'm subscribed. I get to the point of choosing a data center, then the next screen I get is a black box and the game freezes.

Any suggestions on what to do?