I had this problem before, but forgot how to fix. I have two strange files in my trash that won't delete. There are a bunch of strange characters for a name. i've tried the force erase, pulling it out of the trash, and renaming it. Nothing worked. I remember reading somewhere that it has to do with my bootcamp and typing something into the terminal will fix it. Unfortunately I don't remember what to type into the terminal, but it worked last time I had this problem. I don't have windows on my mac.