Looks like your computer is infected with a Sality virus. This kind of virus plants malicious code on your computer and will often attempt to infect every .exe file it can get its hands on. Your game was most likely infected by the virus. Sality is very hard to remove, as it can duplicate itself into every .exe file on your computer in a way that can't be reversed automatically.
Ahh, haven't used Game Maker in so long, let's hope I can make something decent by the end of the Jam
For anyone still trying to find an idea, Just write random things to do with monsters on paper, or in notepad, and just develop the idea, even if you won't use it You're more likely to think of something good if you are in a monster-game theme mindset.. I did this, and while I'm not using alot of these ideas, it helped me think of the idea I am using