Persistent Crashes on Game Startup

Issue started abruptly a few weeks ago. I'm unable to successfully start game, even in single player. Launcher runs, goes to Minecraft main menu but when I click on a world save it starts to load but stops and returns to launcher, usually without a crash report or says my game is suspected of being modded. Dev console often says some sort of error occurs with Java (often with the game ending with a bad state with [exit code 1]) but I have uninstalled and reinstalled it (Both Java and Minecraft) and it still won't work.