When I try to boot the game, the laoding screen appears and then freezes after a couple second. Any suggestions to fix this?
1) Which operating system are you running?
2) How do you launch the game? Directly from the .exe/shortcut or from Galaxy?
3) If you launch the game directly from the .exe/shortcut, is Galaxy running?
As TheHappyFriar said, there might be a popup window or similar behind the game window waiting for your response and the game appears frozen. Please try alt+tabbing to see whether there is such a popup window.