SF4 not running

Hi guys. It’s been a while since I last visited.
Well, I haven’t played vanilla SF4 for quite some time as well, so I decided to play now. But, oddly, the game doesn’t show up. I opened the task manager and tried to run the game, but its process is just closed a couple seconds after I open it. On the other hand, SSF4AE runs just as normal as ever. I just have no idea of what happened… anybody can help me?
Thanks in advance.