the launcher

i am trying to play Minecraft and open up the Minecraft launcher for me to be able to paly but it wont open at all and i tried everything to open it. and it still has not open at all and i am having problems trying to get in to be able to play and i double click it and it says it is loading but not even opening up at all and i need help trying to found out what is wrong with it. because i have good Wi-Fi and good internet to and i have no idea what is happing.