ZSNES Problem

I’ve had ZNES on my laptop for a long time. I’ve stopped using to for a while when I was dying to finish DW7. Now, I go back to it, open it up and all that appears is big black block in the middle of my screen. I have to CTRL+ALT+DEL to kill it before I can do anything else. I’m just confused as to why this would happen out to the blue. I’ve tried deleting all my files, redownloading and unzipping them, but that doesn’t help, so now I’m asking here. Help! Thanks in advance.