So it's the antivirus software thats flagging GameMaker software as virus. That's why the uninstall file is probably missing aswell.
Hey! Your antivirus software should allow you to restore files from quarantine and flag them as safe to use. Antivirus Software will often falsely flag games made in known engines for different reasons. :) This goes for the Defender on Windows-Systems too.That should allow you to actually play and/or uninstall the game as needed. Should you not know how to handle that, you might need to look up a guide for your specific antivirus solution. Keep in mind that this is a free game for you to enjoy and the devs are actually pretty awesome for trying to help out in case of problems like this instead of just leaving you to your vices.