Please help me.

[rightyfan]

So recently I downloaded Mental Memorial, so, I get the file, and I replace all the files in Amensia with the Mental Memorial file. And suddenly Amnesia doesn't work for me. Whenever I open it I can even launch it, the launch button is covered and whiteness and the whole screen blacks. I don't know what the heck is wrong with it but I really want my game back. Is there anyway I can fix it? Thanks.