"The associated scripts can not be loaded."

This problem occurred after I restarted my pc. I've been working on this game for some weeks and everything was fine, but now it somehow went corrupt. There is also one script, that seems to be broken completely. When I try to open it, I get a blank Windows Notepad and other scripts can't access it anymore. Does anyone have an idea, how to solve these two, or at least one of the questions?