Whenever I try to play Minecraft, it pops up with an error saying "Game Already Running" I've tried restarting my computer, and looking online for fixes. How do I fix this problem?
Since we aren't getting an answer from Currupt_Bat I will provide the solution whenever I had similar problems:
Open your Task-Manager (Ctrl+Alt+Del) and look for the process "minecraft" and manually shut it down. Problems like these usually appear if you have not enough patience and start the application multiple times, by clicking it's icon multiple times.