Whenever I attempt to play single player or multiplayer game (with fully working wifi)my game crashes.

Put the summary of the bug you're having here

What I expected to happen was...:
I would be able to play the game as usual.

What actually happened was...:
Minecraft crashes, even though I re downloaded the game several times.

Steps to Reproduce:
1. Run game as normal.
2. Attempt to enter a game, single or multiplayer.
3. Watch as the game crashes.